A few days ago I tried with a USB a distro that is kinda related to Solus, Pisi Linux (eopkg is a fork of the pisi package manager), and I liked a lot what I saw, it felt fluid and simple, reminded me of Solus. Apparently it's not rolling release, but the software was quite up to date, Firefox 97.0.1, Chromium 98, KDE Plasma 5.24.2, it even had Budgie in the repository, for the Budgie lovers!!
I have uninstalled Solus several times (the distrohopping spirit is strong in me) and I have always regretted it, so I don't think I'm going to do it this time. But I'd like to try this distro some day.