My iPhone 13 is likewise still ticking along, most nights I put it on the charger with over 70% battery remaining. Of course, about the only thing I use it for is reading e-books, which isn't very taxing. Also a little photography.
If the upcoming folding iPhone supports the Apple Pencil Pro, that'll be the first tempting phone feature in years. It would be fun to have a digital sketchbook in my pocket. Of course the price tag will probably cancel the temptation.
Part of me is sad to see so little innovation in new phones, but another part of me enjoys keeping my money.