I mean yeah everybody has their own threat models so go for it just understand what you will be giving up. Assuming no recreating accounts, if you want to further isolate it I would recommend using everything meta related through a privacy friendly browser that has ad/tracking protection, aswell as an always on vpn or DNS solution that has an option to block ads and trackers.
Edit: If you want a simple addition using something like trackercontrol might be another useful tool to help you
Piped for desktop would be a better option for youtube imo, but really depends on which “Big tech company” you’re trying to hide from and what information do you want to share with them. For example, Google probably has your ip tied to your gmail account, which has whatever information you used, since you didn’t use a vpn when first creating it. Also unless you disabled the bloatware via adb that came with your xiaomi device some other third party company may also have your ip and whatever info you inputted into those apps, if at all. Again just depends on what you want so your setup might be fine.
Edit: if wanting to protect from google then your mobile device is the biggest issue. Getting an always on vpn is a must (look at proton or mullvad), remove your personal account and create a burner with fake info and use something like aurora store with that burner account should help a lot. Would be really inconvenient if you still use your personal gmail account so maybe before doing anything start migrating to a different email provider
Edit 2: if protecting from meta then facebook messenger is the biggest issue. Getting an always on vpn that comes bundled with protection from trackers/ads (mullvad and proton i think does this) maybe your best choice unless you want to recreate your account and lose all of your contacts/messages which would be really inconvenient. So just treat facebook messenger like a public forum and dont give up too much info. If its possible maybe use a hardened browser, like mull +ublock, instead to use facebook messenger again if thats possible
Regardless of os full disk encryption is your friend and keep regular backups incase shit hits the fan. Rely on bookmarks as much as possible to minimize your chances of clicking on phishing links and stick to trusted sites. Lastly use a trusted vpn with a killswitch even if you dont think you need one it never hurts.
Im a firm believer you can like the art and not the artist but if i had to pick it would be the wizard of oz. Honestly what the director did to the actors/actresses on wizard of oz really zaps the magic out of the movie for me.
If in the states, fake info plus a prepaid carrier should work, right? Havent brought a sim in a bit but you should be able to just buy one in a drugstore with cash or has that changed
Edit: should go without saying but I would also opt for a carrier that offers totp as a 2fa method
For security: aegis (totp manager) , keepassxc/dx (password manager), veracrypt (local encryption) and cryptomator (cloud/mobile encryption). Thats it pretty much everythng else I use is more for privacy Edit: cant believe I forgot about ublock origin. it’s like a condom for the internet