I've cancelled my subscription yesterday, conveniently it was about to renew at the end of the week, so I have a few days to migrate from Proton, here's what I'm thinking of, but I'd love to hear what other people are switching to
I bought my yubikey at least 7-8 years ago and then stopped keeping up on comparisons. I honestly have no idea which is the best, because there are varying use cases and standards available. Yubikey works for my use case and threat model, but I have no idea what would be best for yours. I wish I could be more specific for you but also don't want to give you misleading info.