Ah I see, yes app/web OTP is one of the best methods, unless people are calling to report the app/website not working (a workflow I’ve seen many times) The industry has put hundreds of millions into voice recognition but the sample size required for AI to trick voicerec is really low now.
Jigsaw puzzles, the bigger the better. It keeps you constantly mentally engaged and the act of reaching for pieces and looking around is good physical activity too. I get back ache if I do a jigsaw session for the first time in a while. It really tires me out before bed and can prevent that rumination before falling asleep. Finally it’s really cheap, there are limitless puzzles in charity shops and even some libraries lend them.