RamNode has a KVM VPS range with 1 TB HDD storage for $15/month.

I've used their VPSs many years ago, and they were excellent in terms of performance and support. Nick, the owner, has sold the company since then, and I haven't used them lately, so I'm not sure about their current standing, but worth giving them a try.

The other option can be to store the text files as objects on Backblaze B2 or Cloudflare R2 for cheap.