Good to hear! In that case, priority over other users is not a concern, at least. Honestly, given your question, just wait. If you are open to rebranding aft

Good to hear! In that case, priority over other users is not a concern, at least. Honestly, given your question, just wait. If you are open to rebranding after joining YC, then I just don't see the reason to spend the money on registering a trademark. As I said, the priority issue seems to be taken care of for you. And while there are other benefits to registering, don't worry about those until you are convinced this is the name you want to use. Good luck!