Sleeping tips- 5 month old

Ok. So my son who is nearly 6 months oldhas  never been a good sleeper. 0-3 months just figured it was normal, 4 months I read about sleep regression and honestly believe it really is a thing. Started getting better at 5 months yet still waking through the night. I am not sure if not he may be teething ( not feeling or seeing anything) but be wakes around 11:30 and doesn't settle himself for nearly two hours. I'm gonng in and out to check on him but trying to not pick him up unless he's pooped. I am not sure what to do! Trying everything. He's only ever slept through the night completely 3 X ... Any tips!?!  Thanks