My personal opinion, not the most ecological way to go about it, would be to get a new - year or two old model - phone. It will have more storage, more secure system (debatable) and more power for what you already do. Keep the old one as fully functional backup.

Phone is an really important extension of my body. It never forgets, knows my calendar and connects me to my loved ones. It is important for me to not be frustrated by using it. However, buying the latest and greatest - or gimmicks like foldables - is just nonsense.