Relying on bottle

My son went back to relying on the bottle to falling asleep. HELP! We sleep trained at 6 months and were doing good. Then we went backward (our fault.. he’s our last child and we totally babied him during quarantine). He started falling asleep to the bottle and we should have stopped him and laid him down awake. Now we’re regretting it!

It’s such a hard age to go back and re sleep train but he just wants a bottle (small 2-3 oz of whole milk) when he wakes up and is even doing it in the middle of the night. He slept through the night for like 2 weeks and is back to waking up again once or twice and wants milk. No it’s not a growth spurt.. it’s been going on too long.