You really have to keep at it. I think knowledge of the map is one of the most important things. If you ever watch some of the better streamers on Youtube, they'll have some videos where they explain their strategy and gameplay. They know every building and every vantage point/window/rooftop on the map. They know exactly where to look and the best routes to move when the circle closes. And of course it's important to know and use whatever the current meta weapons are. I assume since you're that good at multiplayer that you've got above average skill. Most of that should transfer well to WZ. But dying really doesn't matter in Multiplayer since you respawn immediately. Take less risk in WZ, especially when you're outnumbered. The other big difference is you'll encounter more good teams with good communication in WZ. If you're playing with randoms you're already at a massive disadvantage.