Yes I was thinkin the same, but that doesn't make much sense, I stopped playing in late february 2021 during my playing time I only did quests and leveling.
I dont see why I would get suspended after my break, plus, for no particular reasons.
I have a similar issue. I last played around January 2014, and let my subscription lapse of my own accord. Another one of my accounts is useable, but my main one has the same "password invalid" issue that OP described. I've tried a bunch of variations of password combinations. Even the same password as the other account, which I know works.
Support has recently requested some information from me, presumably to verify that I am who I say I am. Hopefully it can be resolved quickly!