CSP Account suspended without notification, no explanation given

Thank you both for the replies, and sorry for the slow update. Here's where things stand.

It took several more emails and multiple support cases before the Partner Lifecycle team finally confirmed what happened. Standard Partner Center support has been useless throughout this: every case just gets the same copy/paste reply citing section 4.b, with no actual investigation. The Partner Lifecycle team confirmed that my account was indeed offboarded, less than a month after I renewed my Partner Success Core Benefits in January. That's the part that stings most given everything else here.

The worse part: even the Partner Lifecycle team, who can see that the account was offboarded, don't know why it happened or who triggered it, and apparently there's no mechanism to reverse an offboarded account. So I'm stuck with a system that flagged and killed my account, a support team that just recites a policy clause, and now confirmation from the one team that actually looked into it that they can't undo their own system's action.