I also run with the base VPS storage (25GB) and still have 5GB free (have other stuff running on the VPS besides Lemmy, but not very big either). Pict-rs supports object storage, so it would be trivial and pretty cheap to get a lot of good storage. Providers such as DO and Vultr (and the big players too ofc) provide about 250GB for $5/month, but I've heard a lot of great things about BackBlaze, which apparently bills $5 per TB... I've not tried it, so dunno.

Point being, storage isn't really an issue :)