4/5 sleep regressions - does it get worse?!

21w old baby hit the sleep regression about two weeks ago. We started sleep training before, he was sleeping u til 4-5am without any issues and going to sleep himself for most naps. A couple days after his 4m check up he started waking up at 3am then 12am and just won’t go back to sleep himself. He’ll cry for hours. It’s around this time he has been trying to roll over and is currently bin leap 4. At least through this he’s been able to put himself to sleep at bedtime which has been my small sliver of hope. Well A few days ago he stopped putting himself to sleep. First night I kept trying to give him the pacifier and after 1.5hrs I just put him to sleep. The same thing for the next two nights just won’t go to sleep himself!

This is the sleep regression right?! and it’ll pass? b How long and when will I know it’s over?! It’s been two weeks already!