here's what i think i'm gonna try: change keys during a song and make it sound as bad and unfitting as possible. that way, i'll get closer to knowing what i like and what sounds good depending on the situation (in regards to changing keys/going into a new section). i hope this helps make me better at doing key changes that sound fitting and natural
make sure you learn the ones you like. because that's the whole reason you found yourself in this situation, wanting to do a 'key change.' get to the origin of your interest here