2 yo still not sleeping through. .

Hello everyone, so i would be interested to know your opinions/advices about this.
My son just turned two and is still not sleeping through the night yet.
If he wakes up 2-3 times, it's a good night. So you've guessed it : we are freaking tired...
We have a bedtime routine (laying beside him, singing lullabies ) and he sleeps in his own room. and at around 2-3 am it starts. We give him something to drink, change his diaper. He falls asleep. But then he can wake wake up every hours til around 6 am he's wide awake.
We tried many things (dressing him more or less, not letting him do his daily 2hrs long nap, feeding him more in the evening, etc) but the only way he'll sleep good is when he sleeps beside us. Which is not a long term solution for us (or should I say for my husband more than for me..). So it seems definitely more of a security issue more than a physical one.. He naps very good (have to wake him up after 2 hrs).
Is it "normal "? I thought by 1 yo most kids sleep through. .
Any advices?
As I mentioned, it is not a new phase, he never slept through and i do not want to let him cry like this 5-10-15 method..
Thanks to all of you in advance for your answers :)