Absolutely fantastic, considering your age! I was far, far worse than you are right now on this path to better privacy. Truly exceptional.
I commented in the post you reference, and I'd like to comment here too since I do see some things that can be improved (some of them, I employ for myself, whilst the others are still on my list to implement).
What made you use FreeBSD over everything else? I assume you have some experience using *nix-like operating systems, and the slightly more pro-user distributions like Gentoo and Void do seem BSD-like in operation. I'm just curious.
About Wireguard: it's a very good solution, however unlike other VPN projects, it doesn't have a way to natively hide its trace; i.e. OpenVPN and the like employ certain mechanisms to appear like HTTPS traffic to firewalls, which allows for better obscurity when using a VPN. Certainly useful for special cases, I remember seeing a comment somewhere that a school had disallowed VPNs on its campus network and the only way was to use a specific proxy that made it appear like HTTPS.
Ever tried a Blocky DNS + Unbound + Wireguard combo? The first is a DNS server with nice features, the second can be a DNS resolver, and the VPN is to obfuscate the IP from where you resolve your DNS queries.
About the webcam and microphone on your device: if it's an older laptop, you can simply take the front cover of the screen off and disconnect the cable to it. It's pretty easy with the older Thinkpads and with some newer laptops too, just needs some practice.
Time to nuke your online accounts and (if possible) use stylometry analysis to measure certain triggers in your writing. I have yet to implement this myself but the idea is to have an LLM rewrite my answer whilst removing said bias and write in a generic tone.
I'll club payments and online shopping together: learn more about XMR. It is possible to use LocalMonero to exchange fiat to Monero directly, and once it reaches your wallet you can go through a generic churning process (not sure what it's called in Monero or if this is required, I need to look into it too) and finally, purchase gift cards using the Monero you have now. If the cafeteria accepts debit cards I think they'll accept gift cards too, but you might want to check. You can purchase Amazon gift cards, gift cards for ISPs/mobile network providers too.
Glad to have found another that likes to collect physical media! If I had the space I would have invested in a few CDs myself, but alas; FLAC it is (not complaining!). Which CD transport do you use?
I don't use office tools these days but I'd learn latex if I really needed to create PDFs.
I probably don't need to tell you this but RF hacking is really fun, I'm only really starting to look into it. When I get time!
I came across a few tools which I hadn't heard of before; thanks for the effort in creating your post. I hope you have a great time pursuing this path!