In 2005 Miller along with his father Master P founded a new record label titeld Guttar Music Entertainment.Also in 2005 Miller along with his brother Valentino Miller and their three cousins C-Los, Lil' D and Willie J formed the rap group Rich Boyz and on November 22, 2005 they released their debut album titled Young Ballers: The Hood Been Good to Us via Guttar Music. On April 4, 2006, Miller released his debut digital album Lottery via Guttar Music, Urban Digital and Go Digital Music Group, it was Miller's first album released with his official name changed to Romeo.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 Hollywood Dream Music; the album sold over 30,000 copies worldwide, but the group would later disband due to 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/artist's Lil' D and Black Don and "They Dont Know".They released their first single "The Only One" and they were scheduled to be releasing their debut album, touring and a TV show later that year, but the group would later disband due to unknown reasons, the group also 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".In 2008, Miller stated he was working on his fourth studio album titled Gumbo Station.On March 3, 2009, Miller released a compilation album titled Get Low LP that contained singles that were originally supposed to had been on Gumbo Station and also contained original songs from his previous albums it would sale over 20,000 copies.
In 2007, Miller was offered and accepted a scholarship to play for the USC Trojans; Miller would play for the team until he was let go before his junior season in 2010.He is the nephew of rappers C-Murder and Silkk the Shocker, cousin of producer, singer and rapper Mo B.Dick and the brother of singer and actress Cymphonique Miller. 5 on the Top R&B/Hip-Hop Albums, selling more than 200,000 copies in its first week out.; the show was successful on the network and went on to run for three seasons.
In 2006, Miller released his digital album titled Lottery it was his first album released with his name changed to Romeo.
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 his dad Master P and No Limit Records.