What do I need to do if I want to use my old 4th gen iPad in 2023?

I recently was able to get back my 4th gen iPad that I used for university and got excited to start using it again just for basic stuff like searching stuff on the browser, reading comics and such. However I quickly realized that I was unable to download anything from the AppStore as my iOS version is 10.3.4 and apps like Firefox request at least iOS 14. This wouldn't be an issue if I still had the apps downloaded but it isn't the case.

I was able to re download a few apps through the Purchased tab on the AppStore but some of them are not available anymore (ComicFlow for example). So yeah... What now?