Dropping to one nap help!

My little guys been napping 8-10am or 9-11am and usually refusing an afternoon nap. He usually wakes around 645am but he’s been waking up earlier lately especially when he only gets one nap the day before.

He still sometimes naps twice a day 9-1030 and 2-3ish.

Should I start trying to keep him up later and later for his nap? He’s not too cranky in the afternoons considering he’s been up for 7-8 hours 🙄 but he does wake sometimes 45 mins after bedtime and needs help getting back to sleep lately too