ryuki
Keep your computer, it doesn't cost you anything to keep it.
Computers do alot of things that phones cannot, you just don't know about them because as you stated you're not "tech smart". Even though you have more tech smarts than alot of poeple which is why you're here.
At a very basic level it will allow you to have a device with additional backups of information incase your phone goes down. If you're phone goes you will have no other way to communiate, but if you had your laptop you can always still access and send out emails, check accounts, access your passwords, pay bills, etc. Also PC's are just better and faster than phones for things like writing documents, researching, so on and so fourth. Sometimes having a bigger screen and a faster way to input information (with all your fingers instead of two thumbs) is helpful.
If you don't care about any of these things, then use your PC to learn. If you weren't considerate of your privacy and security, you wouldn't be using GOS. So learn even more using your computer. You can learn how to use virtual machines, encrypt flash drives, use specialized operating systems, so on and so fourth. Try a linux distro (https://pop.system76.com/), it's "windows like" in the sense that it has a full GUI (you don't HAVE to use command line), but gives you the perks of things like full disk encryption, limited telemetry, etc.
Phones are first and foremost communication devices, they were never originally designed for being a massive entertainment or do all system. Part of privacy and security involves compartmentalization, by doing EVERYTHING on a single device, you're creating alot of digital exhaust originating back to one device. Might be better ways to do things. Also, the more "not phone stuff" (social media, this app, that app, so on and so fourth) you add to your phone, the more data is being collected about a device that you carry with you everywhere, everyday. Food for thought.