You could do the screen replacement yourself which honestly isn't too difficult if you follow a repair guide such as the ones iFixit make available. You may find it cheaper to find an iCloud locked 5c with a functional screen than to buy a replacement screen itself, and you have spare parts should you need them.

However, I believe the 5c was a bit of an underwhelming phone because it was effectively the same as the iPhone 5 that came before it. The latest iOS it got was 10.3.4, which is pretty much unusable in 2024 without jailbreaks. You would need to find tweaks to try and fix apps that are broken, and force the app store to serve you older versions of apps. It's possible to try and make it usable but I do honestly think it's a losing battle as more and more apps update and break compatibility.

If you're really into the form factor of the 5c you could find a used SE 1st gen which got to iOS 15 but still looks exactly like an iPhone 5, as these are still very daily drivable without jailbreaks.

Otherwise, I'd usually say its best to keep your S7 going, and install custom ROMs like LineageOS to keep it going further. If an Android phone has mainstream ROM support (by LineageOS or hobbyists on XDA Developers) it's usually much easier to keep it going for longer than an iPhone, and it's usually more secure as you're getting OS updates again.

My iPhone 4s is a proof of concept device that shows it's possible to have it work with some services today (Fediverse via old.Lemmy.world, Spotify, Discord, iMessage, Reddit via Narwhal, Maps, Telegram, YouTube via m.youtube.com, and Hacker News) but it is a very slow and patience testing experience in nearly all of those. I would not consider my 4s daily drivable and it's exactly why I use it for a distraction free music player with modern conveniences.

Edit: I should mention that a community I frequented on Reddit was r/LegacyJailbreak, so they will have much further information for you should you want to ultimately repair and reuse your iPhone 5c