I believe server boosts are still a thing? It was only the other week I was checking it out on Zap Hosting.
On the other hand, if you’re wanting your server to show up on the right hand side (the sponsored / spotlight servers), you’ll have to gain some attention and prove that your server is unique (and not just another rip-off RP server using ESX etc).
Reference: How to get a sponsored spot in FiveM?