Get a NAS or storage server lol
Oh I built a couple of those (FreeNAS, OMV) before when I was hosting literally all the entertainment- tv, movies, videogames, music- for a household of 6. But now we have real internet I torem down and just packed and backedup everything on the drives I have now(these are all external, for archival usage and rare access)it's just my personal archive. I hadn't had any of them even hooked up in over a year til the other day I was looking for an old doctor who episode and didn't want to use hbomax. Different drive for each type of thing(completed series, ongoing series, movies, music, software/files/photos backup) and a duplicate of each drive.
I like stuff separated a bit more, and most of my regular use drives are in at least 2 partitions apiece- SSD has windows partition and game partition, the rest are reg hdds split into similar sets to the externals, but I download direct to the active drives by type. When things get too tight I do some migration and backups to the relevant externals, but I've been a little slow to do that lately, thus the overfilling currently. Have no need for a full-time NAS anymore, just offline storage and duplicates. With real internet and access to nearly every movie and TV show in existence streaming, why would I need to host it myself anymore? Same reason I no longer run an emu server, I can access Live lol.