Here are a few suggestions for the game, otherwise, players might get bored after a while:

Can players host their own rooms or set up private servers?

Can players restrict specific weapons, equipment, and skills?

2-1. There needs to be more skill categories. You could add mechanics like sprinting, sliding, and diving to prevent players from being easily picked off by snipers. Conversely, for snipers, you could introduce a rifle that deals a one-shot kill to the upper body within a certain range.

2-2. The weapon variety needs to be increased.

2-3. Taking a page from Battlefield 2042 or BF6, how about releasing a map editor?

Can you support mods so players can DIY their own content? (e.g., weapons, equipment, skills, and vehicles.)

Can you introduce Team Deathmatch (TDM) servers?

Regarding classes, could you diversify the weapon options? It feels like a major disadvantage for Recon (Sniper) classes to only have access to sniper rifles and no assault rifles.

There are too few skills. You should look at Call of Duty or Delta Force for inspiration.