How to get baby to sleep later in the morning

My LO is 5 months old and has honestly always been a great sleeper. About a month ago, around the same time he started daycare, he started waking up earlier though. He gets up around 5am now, and I'm not sure how to shift things so he sleeps until at least 6 (used to be he'd sleep until 7am). He falls asleep around 7:30pm most nights and either sleeps through or wakes up once around 1am to eat (I know I'm incredibly lucky here).

Some things I've tried so far to get him to sleep an extra hour (none of them have worked): dream feeds at 2am, 3am, or 4am; putting him to bed later; making his last feeding of the night bigger (he breastfeeds, so I don't know how much bigger, but I started feeding him both boobs when he used to only do one). Since he's in daycare, I don't have control of how much daytime sleep he gets. I'm not sure what else to try.

Any suggestions? Or just count my blessings that he's otherwise a really good sleeper and I need to start going to bed an hour earlier instead?