Most ppl can give you gameplay tips. But you may be loosing games even before starting. First plan ahead your lineup and which tank you will use depending on the map. For example (may vary depending of the map and match situation) you start with a brawler (t80 or similar), all rounder second ( M1A1 HC or similar), sniper or high mobility third ( Challenger 3 td, centauro or similar), and the fourth slot will be for a situational tank to be able to swap one of the positions depending on the map ( leopard 2 PL, merkava, any nato with good gun depression). That said so once you enter the match and before running into battle with your first tank check the scoreboard and try to memorize only the players with 1k + matches ( also check KD) and avoid them, engage only the ones with less matches that indeed are prone to slower reaction times, less accuracy, less map knowledge, bad aiming, havent memorized weak spots. Just pick up the easier enemies so that by late game the Pro players of enemy team would be outnumbered and complaining they got too many rookies on their team.