An account on the XRP Ledger becomes activated when the first 10 XRP are sent to it. Any reserve that is applied to your account, stays in your account. The XRP Ledger simply marks the reserve amount as 'unspendable'. If you delete your XRP account you can get it back https://help.xumm.app/app/learning-more-about-xumm/deleting-an-xrpl-account