your account hasn’t been closed. Did you forget your password? Then just click on the link “Paswort vergessen” and create a new one.
Your content is still there. Let me know if you need further help.
I think I know now what the problem could be:
you have an account on the EU-platform(spreadshirt.de) and another one on the NA-platform (spreadshirt.com). On .com all your designs where rejected due to copyright issues.
But neither your .com nor your .de account was deleted. Maybe you just mixed up your passwords?