It doesn't matter how much you sold years ago, the rules apply to all sellers and all sellers agree to those rules when they list

Have you fully completed sign up to Managed Payments and been verified to sell?

All sellers have been required to do so for over 6 years now

You agreed to the 15-30 days hold on your funds when you listed, and yes, the holds will apply to all sales until you prove yourself as a seller, and again if you go a long time between selling

None of your completed listings are close to being 30 days ago

Begging is not going to achieve a single thing

No, it is not theft, it is the terms you agreed to when you listed