Help your fellow first time mom!!

I recently asked how long are your babies sleeping and was surprised to see that most of your LO are sleeping through the night!

So I have a problem! My little boy is 13 weeks and I do his bed time routine and he's out by 7. He then wakes up around 9:30 and refuses to go back to sleep, last night I was up with him till 2am. Like the slightest sound/noise/light will make him so alert. After he finally does go to sleep, he sleeps for almost 6-7 hours now. How do I adjust my time so he sleeps from 9pm-8am or something more reasonable like that lol??

He then will continue being sleepy (long naps till mid afternoon sometimes)

I also breastfeed him the whole day( sometimes I will pump and give him the bottle if he's being fussy or if I'm out and about) but I keep his last feeding of the night formula because I heard it helps them sleep longer.

Do any of you have a routine for your three month old?? Please share I swear I will follow it! Clearly I'm not doing something right here!