I might actually do this with an old-ish device I have after my upgrade recently
full-on reinvention of your smartphone from top to bottom. With a little patience, you can have your very own proto-Light Phone experience in less than half an hour
I made my Android phone a whole lot simpler, and you can too(without the 400 bucks price tag of a light phone)
https://www.androidpolice.com/simpler-smartphone-experience-digital-detox/