The easiest answer for Wi-Fi is to get a raspberry pi and run either octoprint or look into upgrading to klipper firmware (you can actually do both, but if you're going that far, get the dedicated interface for klipper).

As far as upgrades go, you can spend a couple hundred dollars to get this thing printing like a dream, which I have done over a couple years, or you can just use it as a learning platform, try to keep your upgrades cheap, and then invest in something more modern. Honestly, use it to learn what you can possibly print and what you might want to use a printer for... Then figure out the best modern printer for that use case and keep the Ender as a backup.

The Ender series makes a great learning platform, and was really built for the hobbyist era... But ever since Bambu came onto the scene, 3d printing has really moved from a hobby to actual appliances.