If you’re happy with those services … maybe you shouldn’t?
I self-host because I prefer to house my data locally when possible. It’s easier for backups and I’m not subject to the whims and financial decisions made by a company about whether their service will remain available, what it will cost, what functions it will offer. The tradeoff is work on my part, but I enjoy tinkering and learning.
In my case, I self-host a NextCloud instance for remote access to my docs, a Calibre Web server for eBooks (and to share those with a few trusted friends), a Vaultwarden instance because I’d prefer my vaults not be stored by a company whose servers are likely a major target for bad actors and that could change its TOS or offerings in the future.
It started well ahead of actual BF, but Best Buy has 18TB Easystore drives for $200.