We are in a somewhat same scenario.
Our singer left in November 2019, she gave us plenty of notice and was upfront about the situation. No probs there. But the lead guitarist is her other half and we agreed to continue with a different vocalist.
We found one with more of a bluesy voice but she can belt it out, then covid with all plans put on hold. Got together in September last year and managed 1 rehearsal before lockdown again. There was a distinct lack of enthusiasm from guitar boy.
Since then no contact from him, he has deleted his facebook account and isn`t answering calls or texts. So as he is a moaning negative type of guy, we have decided to move on without him. One of these guys that even when we played a great gig with the punters right into it, his face would still be tripping him. Myself and the drummer had had enough of his attitude anyway and it feels like a weight has been lifted from our shoulders.
It was always going to be hard to pick up after the singer left but I feel more positive about the future of the band now even if it means almost like starting from scratch again.