P.R.
When my son wanted to get up early, I told him no getting up until mom says it's time and then at night I would let him pick a favorite toy, book, puzzle, whichever, that he would want to play with quietly in the morning and usually he fell back to sleep....I was lucky, he always stayed in bed and "usually" fell back to sleep.
Also try putting him to bed later at night, you can have quiet time before his bedtime, read a book ar just talk about things