Get GrapheneOS, your mobile phone will be one of the best sources of data about you, and if you're on Googled Android or IOS, there's nothing you can do to stop google apps stalking you, which they have already had several lawsuits about doing it even when you disable it. GrapheneOS takes care of it by sandboxing google apps, so they can't do almost anything, along with really fine-grained permissiion control, i.e giving messenger access to only selected photo you want to upload, and nothing more.

As far as browser goes, I recommend Mullvad, and bundle it with their VPN. Not only can it be payed for by Crypto, it also means that almost every other VPN user will have the same browser fingerprint as you - fingerprint of the Mullvad browser, which is based on Tor browser and designed to be as unfingerprintable as possible, so it will be really hard to distinguish you using secondary fingerpriting, such as extensions or minor browser details.

Don't use Gmail or GDrive, ideally get your own NAS for file sharing and switch to something like Protonmail, which now also offers Drive. Get a domain that is vaguely company-sounding. Something like @techcorplimited.com, and create a catch-all email address, so any email sent to that domain will end up in your inbox. You can now use randomname.randomsurename@techcorplimited.com as your throwaway email address, and just randomly generate them for all services you use, while also making it believable to confuse even AIs.

Even when using VPN, don't sign into your accounts. You don't need to sign in to Youtube to tell it that it was you all the time, just remember your favorite youtubers and look for them by hand every time.

If you're really serious, look into https://www.qubes-os.org/