Don't main any. Have preferences sure but if you are in matchmaking and your preference is already picked, be competent with other options.
Be able to look at composition and balance your team. If it looks like you need a tank, be able to play one. If everyone picked tanks and healers, pick a dps character.
Also don't be afraid to switch during a match if one isn't working well. Learn to counter the other teams build.
I do find myself picking some of the same characters over and over again but I can say that my top 3 have similar amounts of playtime with a fourth not far behind. There are a few I never pick but get practice with in All Brawls and Mystery Heroes playlists.
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Thank you. I wish everyone was this smart