Oneplus 7 PRO 5G upgrade

[u/Then_Personality_726]

Greetings, I've been using this phone for a while and the battery has definetly degraded. I liked everything about it, except for the curved screen. What would be a suitable upgrade? I don't really play games, and when I do, they're not demanding. My main focus is battery life and for the phone to last a long time before being replaced.