It's pretty hard to unring a bell, but Berlin's Terri Nunn is attempting to do that with an abject apology for performing at the Mar-a-Lago NYE event.
In her apology, she focuses on both the unsafe and politically dodgy aspects of her appearance there, pleading ignorance over Florida's (and Mar-a-Lago's) disregard for coronavirus safety, and pleading that her presence at the event was not intended as an endorsement.
She also directly apologized to LGBTQ fans, stating:
My apologies to those in the LGBTQ community who thought my performance was a statement against them. I have been and always will be fully supportive.