You need some coaching to train your skills as a single player.  Recently I got CoD Warzone 2 LFG  and it was simply fantastic.  Quick, reliable and friendly so I would definitely recommend or use again if I had to. Also, they're awesome players indeed and I learned something during my short time with them

If you are playing in squads or duos I would say sticking together is the key. Now I realize you cannot all loot the same place at once I know what you are thinking but what I mean is, when you are rotating somewhere else or just traveling in general, try not to get split up because not only will you be able to defend yourself but it also gives you the opportunity to ambush people and apply a great deal of damage all at once. Also, try to stay alive. I realize there are those sick, twisted people out there that instakill the people they down but if at all possible try to keep your teammates alive. Obviously because there is strength in numbers.

In COD, why am I good in multiplayer but I suck in Blackout mode?