I think Mastodon (and any decentralized social media) needs to be easier to host. The thing is relatively a beast to get working, whether you try and install the dependencies separately on a distribution that's not Ubuntu (IIRC) or if you're not familiar with Docker. I host quite a few instances of things for myself but I gave up on Mastodon (I wasn't trying that hard, to be fair) after trouble getting it working behind the same reverse proxy everything else is behind.
If we could get a cross-platform, statically linked, near zero configuration social media tool where I essentially just have to forward a few ports, that'd be fantastic for me and I'd hope many others.
The biggest draw of something decentralization is being able to own and control all my data and having some stranger on the Internet rather than BigCorp own it is not meaningfully different to me.