You can also play games like Reflex, these types of games are made to make your aim better. For fps games I recommend Arsenal, Counter Blox and Frontlines
you forgot to mention „gun spam“ one of the most important pvp tools , its the most efficient and fastest way to kill players by just spamming pistol and shotgun or flint then sniper then any kind of weapon It still works , but the gun revamp made it worser.
