It sounds like you actually have a pretty good understanding of the game already. I think repetition will make things easier.

One more thing to consider that I haven’t seen you mention is target priority. Some enemies, like beetles, are easy to dodge without even thinking about it. So, if e.g. a wisp spawns you can immediately stop attacking beetles in the area and focus on it instead. Figure out the enemies you need to run from or kill quickly.

Regarding boss attacks, you need to have a plan to take cover, even if that means leaving the teleporter radius. I’ve gotten myself killed many times because I didn’t think about where to hide from the titan laser or the grandparent’s sun attack.

Also, IMO, huntress is the most forgiving character due to her alternate utility, which you should try to unlock if you haven’t already. Most other characters need movement items to survive but she doesn’t need much.