necessary specs for a fabric 1.21 server (15 players)

So, here's the deal. It's a basically vanilla server with the only modifications being terrain datapacks, mob sizes, and some other features to make a better vanilla experience. The actual specifics of my datapacks and serverside mods are here: https://pastebin.com/EgkcvrAJ

The plan I have is Pebblehost Premium 6GB, 3 threads for now. There are a total of 15 players whitelisted on my server. When there are around (~7) people online, it stays at 19-20 TPS, and the CPU stays at around 120-140% while RAM stays at 6GB/6GB. But as expected, when even more players get online, it throttles the CPU and chips away at the TPS.

(I have completely optimized my server. This is simply a hardware limitation issue now.)

Also, for reference, Pebblehost says it uses a "Ryzen 5800X @ 4.7Ghz CPU"

Right now, I'm spending $17.50, and I'm really just using it because it has nice customer service and a comfortable interface.

Each additional thread is $5.00 and each additional GB of ram is $2.50.

So, how much would I need to upgrade for a mostly lag-free experience to persist?
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