Signal mostly, my circles know I’m chronically offline and thus not on big social platforms. The folks who don’t move to signal know my number and text/call me as needed which isn’t often or super sensitive because the rest of the conversation usually happens in person ¯\(ツ)/¯

ETA: I also have a couple contacts on Simplex, at their behest not mine. Not a fan of the voice/video quality to be honest but it’s fairly secure at least