Miller signed to his father's relaunched label New No Limit Records.In 2002, Miller released his second album titled Game Time; it charted the US Billboard 200 at number thirty-three.In 2005 Miller along with his father Master P founded a new record label titeld Guttar Music Entertainment.
In 2004, Miller released his third studio album Romeoland via The New No Limit and Koch, it would be Miller's last studio album to feature himself billed as Lil' Romeo; it was not as successful in sales as his last two studio albums selling only 30,000 the first week, but the album still sold over 250,000 copies in the United States.
Romeoland charted at #70 on the Billboard 200 and at #29 on the Top Rap Albums chart.
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.
In 2010 Romeo confirmed that he was still working on his fourth studio album but he changed the name of the album to The College Boy.
In 2001 Miller released his debut album Lil 'Romeo, which charted the US Billboard 200 at number six and went on to be certified gold, selling over 500,000 copies.