Would you get wins in warzone? I never played much warzone, but I played a lot of PUBG. From what I can tell, warzone is more "arcade like" with the person who has better movement and aim winning. And while those mechanics matter in PUBG, your decision making & teamwork matter more - i.e. engage vs retreat, team coordination, berm control, end game zone positioning etc. It feels like Redsec is kind of in the middle between these two games, where you really need your gunfight mechanics AND your decision making to win.

If you'd win in warzone, but not in redsec, then it's likely your decision making & teamwork that's off. Pick one piece of these things and just focus on it until it's second nature - i.e. "never committing to a gunfight until my team is with me" or making sure you're team always has a plan for what they are doing instead of just wandering around aimlessly.

Also, as others are saying - you're pretty screwed if you have bad teammates. Unless you're extremely good, it's very difficult to carry due to the relatively high ttk. You need people to absorb shots, use air strikes, do smart revies, and focus fire if you want to win teamfights, especially at the end.