Domain Social Forums

Hello,
currenlty have a AMD Ryzen 9 7950x @ 4.5GHz (16 cores + HT) and 64 GB of ram. However, when I get about 250 users the site crawls and some users get an error 500 page. I have tried MySQL optimization and I use litespeed. I am sure it can get a bit better with better optimization but I need to have it up and running by Nov 1 and so I just want to get a big server for now or maybe a server for website and another for database.

I am looking for something with 40 cores and 128 GB Ram, I run DirectAdmin now but don't really care about the control panel because there will only be two sites on it.
Any recommendations? What can you say about Regvps.com dedicated servers? Are they reliable?

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A dedicated server is necessary for those who have a website in need of specific software or permanent backup.

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Like Regvps.com server hosting solutions: Server i7-6700 - $94/month: CPU Intel® Core™ i7-6700, RAM 64 GB, SSD 2 x 512GB, Bandwidth 10 TB.
The system is superb, with spam controls, webmail and mailing list management about as good as one could want. I’m very happy and proud that I run web sites with them.

Servers from hostingsource.com are well-balanced and worth trying.
I have never faced issues with them, when need any support their friendly team is always available for me.