We have been under attack recently and I have no clue on how to mitigate or to reduce the effects of the DDos Attacks in the server. I have made a search on SAMP Forums (via Web Archive) and I have seen some users suggesting about configuring the Firewall of the VPS.

If anyone is so kind, can anyone guide me or tell me how do I do that? 

We are currently hosting our VPS at OVH.

VPS Info:

Ubuntu 20.04
vCores 2
4GB Memory
40GB Storage 

The DDoS attack wasn't that severe the other day (the server is just causing some delays, no down at all). But the attacker decided to breach in the backend of our panel shutting it down, completely paralyzing the server (the server won't start up even if I start it in the panel (Open Game Panel)

OVH game?