Since 2008: Mixtapes, EPs and collaborations
In 2008, Miller stated he was working on his fourth studio album titled Gumbo Station. On June 17, Miller released the first single from the album "Get Low Wit It", which featured Akon and his brother Valentino Miller, it failed to gain success on the Billboard charts.
On March 3, 2009, Miller released a compilation album titled Get Low that contained singles that were originally supposed to have been on Gumbo Station and also contained original songs from his previous albums. In late 2009, Miller formed a new record label titled The Next Generation Entertainment, the label at the time featured his group the College Boyys.
During this time, Romeo also confirmed that he was still working on his fourth studio album, but had changed the name of the album to The College Boy. Later, Romeo announced that the title of the album would be I Am No Limit. On January 19, 2010, Miller released a promotional single for the album titled "Tell Me a Million Times" featuring Tempo. On January 26, Miller released a second promotional single for the album titled "Ice Cream Man Jr." which was a tribute to his father. On February 16, Miller released his debut mixtape Patience Is A Virtue to promote the album. On March 2, Miller released two EPs to promote the album which were the Famous Girl and Monster/Practice via his label The Next Generation Entertainment and LPD Music. Also in 2010, Miller would introduce his new group the College Boyys; on May 25, 2010, they released their debut album titled Spring Break via his label The Next Generation Entertainment and Hollywood Dream Music, but the group would later disband for unknown reasons. Miller also on this day released three promotional singles which were "You" that featured his artist at the time D'Anna and Lil Twist, "She Bad" that featured his cousins/artists Lil' D and Black Don and "They Dont Know". Miller also performed at the 2010 Hip Hop Honors along with his brother Valentino Miller, his cousins Lil' D and Black Don, and his uncle Silkk The Shocker, along with Trina, Gucci Mane and Mystikal to honor Master P and No Limit Records. In late 2010, Miller relaunched No Limit Records as No Limit Forever. Romeo also confirmed that he had changed the name of his album from I Am No Limit to Intelligent Hoodlum.
In 2011, Miller toured with his father and Silkk the Shocker. The tour was titled "No Limit Forever International". On January 11, Miller released his EP Dont Push Me via his label The Next Generation Entertainment. On May 3, 2011, Miller released the first official single from Intelligent Hoodlum called "Famous Girl (Remix)" which was the mastered version of the original, it still featured the original appearances from Sean Kingston and Miller's cousin Black Don, but it would be later dubbed as a promotional single. On August 19, 2011, Miller released his I Am No Limit mixtape, which was originally supposed to be his fourth studio album, but Miller decided it would be best to just release it as a mixtape for his fans.
In 2012, Miller formed a new group called Resq3 which consisted of himself, drummer Christian Brock and guitarist/vocalist Myles Eberhardt. They released their first single "The Only One" and were scheduled to be releasing their debut album, touring and filming TV show later that year, but the group would disband for unknown reasons. The group's other releases consisted of songs such as "Right Along" and "No One Else Like You". On April 12, 2012, Miller released his first single from his upcoming fourth album titled "Hug Me Forever", which featured his brother Valentino. On May 19, 2012, Miller released the music video for "Hug Me Forever". On August 15, 2012, Miller announced that he had been working on a new mixtape titled Inception, it was released on August 19, 2012, under his new stage name Maserati Rome.
In 2013, Miller announced that he was working on a mixtape, When in Rome, slated for release in 2014.
On January 5, 2015, Miller released his first collaboration mixtape titled We All We Got with his group Money Mafia that includes himself, his father, Ace B, Young Junne, Eastwood, Gangsta, Play Beezy, Calliope Popeye, Flight Boy and No Limit Forever in-house producer Blaq N Mild. The mixtape would also include a surprise feature from Lil Wayne on the track "Power". On April 20, Miller released his second collaboration mixtape titled Hustlin with his group Money Mafia. On July 29, 2015, Miller would release two new singles from his upcoming fourth studio album titled "Till the Club Close" featuring fellow No Limit Forever artist Ace B and "Bent" featuring fellow No Limit Forever artists Ace B and Silkk the Shocker. On December 17, Miller revealed the title, cover art and also announced the release date of his planned fourth studio album titled Fighting Monsters, which was set for release in January.
On January 7, 2016, Miller would release Fighting Monsters as a mixtape; it would feature guest appearances from Ace B, BlaqNmilD, DeCarlo, Eastwood, €$¢Ø, JSlugg500, his father Master P, Silkk the Shocker, and Travis Kr8ts. Fighting Monsters was originally supposed to be his fourth studio album, but Miller decided again it would be best to just release it as a mixtape for his fans. On January 13, Miller would release the mixtape for retail on iTunes for charity. On November 1, 2016, Miller released two singles from his planned fourth studio album titled "B, All, In" featuring fellow No Limit Forever artist Young Vee, and "Shoulder" featuring DeCarlo and fellow No Limit Forever artist Ace B. In December 2019, Miller released the album Hidden Treasure, featuring a collaboration with his father, Master P.