I've just eliminated most apps from my phone, but the web browser is the ultimate killer for this phone. Stuck on iOS 15's version of webkit, no real ad blockers, no real tweaks (as admirable a job as Hyperweb does) I'm being forced to upgrade thanks to the end of iOS updates.
I've decided to try another small phone: the Sony Xperia XZ1 Compact, which is roughly the size of the iPhone Mini with a headphone jack, fingerprint sensor, usb-c, and (most excitingly) a notification LED. Of course software support for this 2017 phone is also long gone, but I'm hoping LineageOS + Android's open software environment (giving me Firefox support for years) will keep things going for a while, at least.
I really wish there was a way to keep software support on smartphones for longer. Now that society basically requires every participant to own a smartphone with a data plan, it's as important as allowing walkability and public transit in cities so folks can live without cars, IMO.