Recommendation for hosting 100 players on the same world at one time.

Loooking for recommendations for achieving this. Having a bungee cord hub with different servers is not really an option with what gameplay we are looking to achieve.

Current server specs is Ryzen 7 3700X 8-Core Processor 3.6Ghz 24Gb ram. Struggling a lot. Have paper. Ran Sparks and no easy fixes. Tried to optimise best i can. Is this just asking too much?

Any advice appreciated.