Early riser help

Has anyone successfully gotten their baby to sleep later? He used to sleep until 530 or 6 but now is waking at 430 or 5 on the dot every day. It doesn’t matter it he goes to sleep at 630 or at 8 he still wakes at 5. Ive tried feeding him and putting him back to sleep but it doesn’t work he’s just up. Any tips? I know I’m lucky he sleeps through the night id just really like him to sleep until at least 6. When he wakes at 430\5 he’s ready for bed again by 730.