Can hiring a pro Overwatch coach make you a better player? https://buff.ly/2J6Il8m pic.twitter.com/W3MmmBpAff
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Probably, but you can also just keep playing, learn from your mistakes, and watch how the pros do it.
For some that works fantastically but consider that having a coach can help you become more aware of mistakes you may not see if you played on your own. One of the greatest advantages of being coached on any subject is getting rid of bad habits you didn't know you had.