What do u think if I wake him by 8 am and wake him up from nap by 3 and put to bed at 8.30pm.
Honestly it doesn't sound different enough to what you are already doing. It's just my opinion. You are the one with him of course.
This routine still expects 11.5 hrs over night sleep with a 2 hr nap. He could well continue to wake in the night for long periods.
It's also expecting more sleep than he was doing a few posts back when he was waking at 7.15am napping 1-3 and going to bed at 9.30pm.
I'd more likely go for 7am WU, nap 1-2 and 8pm BT which gives 11hrs over night. After a couple of days I'd consider capping the nap.
Mine didn't do well with a capped nap at all, he needed the 2hrs, but I accepted a much shorter night from 8pm - 6am, so only 10hrs. Every LO is different of course.