You don't have to do the prioritization yourself, you could do it with the therapist.

You could ask yourself witch bothers you the most.

Also if there are clusters of schemas, start with the ones in the same cluster, but your therapist should also be able help with what to start.

I do know of such a prioritization for BPD where you first have to learn to answer back to your internalized "punitive/critical parent" mode, and eventually eliminate it, because it will sabotage your progress, just like a real life punitive/critical parent would.

You've already prioritized it! If you've found a few things from there that match how you feel that's a great place to start. You could even bring that list to a therapist and go over it with them.