Move:
If you find yourself camping in the same doorway or corner for a good moment, consider if there is another path you could choose. Don't just repeat and peek the same lane over and over. You can move, change place, and try a different angle.
Push:
You don't have to be the first one to go in, but if you see a teammate pushing the enemy, follow and push with them, even if you're unsure about the situation. The matches will be more lively and your teammates will appreciate your help.
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Stay out of fatal funnels.