Relax give it time to adjust and develop new strategy. Compared to a good match in D1, D2 PvP is not as fun because there are fewer people and supers recharge much slower but that might be good in the long run. I am not very good at PvP and I don't like it very much but consider when the enemy team stays as a group you can wipe them out with a super or a rocket. A joke from another game: "The enemy has us surrounded... now they can't get away!" Also find better weapons that suit you and this kind of game mode. eg. Hand Cannons are not the best option because of the fire rate. I did better with ARs, fast fire SRs and sidearms also stick to kinetic because there is damage reduction but instead of reloading switch weapons. That said even after doing better against full pre-made teams I still don't like the 4v4 and only play it for the loot.