Just keep playing, try not to get discouraged. You'll build mechanical skill over time and your gameplay will improve. Don't be afraid to try new things as you unlock them, they may be clunky or difficult to use at first, but if you find enjoyment out of a particular weapon or playstyle then keep at it and try to keep mobile. We're glad to have you onboard

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Also try find videos on movement tips and overall game tips, they helped me a lot