Permacomputing

I'd like your expert advice. My old smartphone is about to kick the bucket, and I can't wait to finally let go of the tiny depression rectangle for ever. How can I keep using OTP and 2FA services when on a dumb phone? I expect that with time I will manage to limit the use of services that require this kind of stuff, but can't at the moment. I don't use my smartphone for much, so I don't expect to run into much trouble, but is there anything else I might be forgetting apart from authentication issues? I'll speak to my bank to see what they offer besides 2FA and app - I'm sure they have something since it's a bank for farmers and old rural folk.

Btw I have been enjoying my collapse lately, as so much over-engineered stuff just starts failing and encourages a retreat to more simple solutions. I'll do my part by ditching the surveillance box.