You get tracked if you give up and accept the privacy invasions because “the internet is just like that”. Get a phone with an unlocked bootloader, remove the stock Android and install GrapheneOS/LineageOS/CalyxOS.

Definitely consider self-hosting for file sharing, because public file sharing sites without restrictive file size and auto-delete limits get abused and shut down constantly. 0x0.st (mentioned in another comment in this thread) used to host files indefinitely but switched to a temporary system because of abuse, so anyone who used it as their file host will now have a mass of broken links. Unfortunately, none of the self-hostable file sharing options with thumbnail previews that I’m aware of support image albums which was the most useful feature of Imgur.

I have my emails set up with Purelymail, they’re great if you don’t need the extra office suite tools and have a lot of custom domain addresses, but I’m also skeptical about the “single point of failure” setup as everything is run by one person and the entire service can go down with him. As far as I’m aware, there isn’t any other mail service that doesn’t charge extra for additional domains.