14 month old STILL doesn’t sleep

At a complete loss, my 14 month old is still up hourly/ every 2 hours (varies).

I feel like I’ve tried everything:

Sleep consultant

White noise (still do)

Dark room (still do)

Dummy (won’t take it)

Feeding extra just before bed (upsets his tummy)

Bath before bed (still do)

No tv for 2 hours before bed (still do)

Comforter (didn’t take to it)

Different ways of dressing him at night

Different bed times (goes to bed 7:30-8 at the moment)

Differnet nap times (not ready for one nap gets over tired)

Varied wake windows

Co sleeping (hurts my back, he won’t sleep in my bed just starts chatting and climbing)

He self settles to get to sleep and weirdly self settles from about 4:30 am?!

So from 9-4:30 I’m up hourly or more most nights. Occasionally get a 2 hr stretch. Sometimes I just go in and lay him down but sometimes he needs a cuddle or milk…

Don’t think it’s teething at the moment (always been slept bad no matter what) and not sick

PLEASE PLEASE give me your tips or even just tell me your routine with your baby. What on earth am I doing wrong? Educate me!!