[Cali Panthers Fan]

Oof. That OP sounds like a touch challenge, and I certainly don't know if this would work, but I'll give what I think is good advice.

Don't change too many things. You've made a lot of changes to the routine it sounds like including a different bed and weaning off a bottle. That's a lot to do at the best of times, never mind WHILE there is an active sleep regression. Kids need consistency and routine. Have a very clear routine that you start at the same time every day, and stick to it. Don't deviate. The pattern is what tells kids it's time to get sleep and go to bed.

Then, consistently tell the child what the expectation is for them and remind them of what will happen if they get out of bed. "Punishment" should be the removal of special treats or good things they normally get if they're behaved well.

Don't ask permission for anything, just set the rule and stick to it. Don't negotiate. Don't give extra things for disobedience. Don't read extra books or give any extra food or any other good things. That only reinforces the bad behavior. If the kid gets up immediately, don't say anything other than "it's time to go to sleep" to them and just put them back in bed. Do it as many times as you have to for them to stay in bed. Repeat as necessary if they get up for any reason.

It might be hard (really hard) for a week or so, but if you stick to a consistent pattern and don't reward bad behavior, the child usually gets it and gives up the game. That's my experience anyway.