Same here. I’m going to get a new battery soon, so that’ll give me a few more years. I’m hoping something comes along in that time that I want. Otherwise, I may just go to a Japanese eInk phone.
It isn't a phone (no cellular) but the BOOX Palma 2 is a fantastic phone-sized Android-running eInk device. Pair it with a hotspot in your bag or pocket and it would be good enough (as long as you don't make actual calls).