As I don’t know how the stack was built on the Premade DigitalOcean Droplet, it’s hard to say if “turning it off” will simply break everything. As the stack might be configured to run through Varnish using reverse proxies.
I can’t condone Litespeed as I’ve never used it, however I definitely agree to avoid Varnish when possible - As the benefits don’t outweigh the pain. Or maybe it does if you have crazy high traffic like Amazon…