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In addition to all of the other recommendations above, if you didn't perform a reset, then yes, you should perform a backup (really nice AMTM script to do this from SSH & command line), perform factory reset, then restore. If at all possible, restore everything by hand instead. If things go south you may have to do this anyway. This assumes that you've waited a day or so and have been able to get to the GUI indicating things have settled down and that you've been able to enable SSH. Good Luck!
I would strongly advise against restoring a backup, I would definitely start from scratch and you'll have a stable a router in no time at all. For now, just wait for the Asus maintenance (the reason you can't login) to be done, so that won't take as long when you start over. When you start over (yes 'when', not 'if') follow the guide by forum member @L&LD, it help you to get a good, fresh start:
Best Practice Update/Setup Router/AiMesh Node(s) 2021