Email me. I'll give you a server to further development.

All the good open source tile servers have pivoted into commercial businesses, and I'd like to support the development of a project that stays open.

- https://github.com/systemed/tilemaker (for generating tiles)

- https://github.com/systemed/mod_mbtiles (for serving them)

tilemaker is similar to planetiler which OP is using (it's more configurable but also more memory-hungry).