I want a serious answer, how should I find people online to talk to about anything really other than politics?
You don’t.
You don’t find people online (or IRL) waiting for strangers to start a discussion on some random topic you feel like talking about. Because people, unlike trolls, are busy with their live.
What you can find is people willing to discuss with someone they find interesting or, with any luck, intriguing on whatever topic you both are interested in.
So, what are you interested in? Have you any hobbies, interests, passions? Find small communities around those topics you’re interested in, and start posting. Do the work to show you’re there and that, maybe, you’re worth discussing with.
I have nothing to offer but some sympathy and one advice: I have two critical backups running: my personal files and the various folders containing my config files.
As I learned more or less the exact same way you just did how critical it is to backup those files too as, losing them by formatting my drive, I instantly realized they’re as personal and important as my ‘real’ files are.