The best thing to do is alternate, if you only really use one legend with the exception of those that require more than one alternate between legends, if you don't you would probably start to suck as using the legend. When you alternate balance it well because if you have a favorite legend and love to Stick with that specific one don't alternate too much to the point where you are only using another legend you might get too used to that one. And you'll suck at your favorite legend. Balancing too less will just slow the process of slowing down by a bit.
Random tip:

celestial glitched mordex 02/16/22
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Brawler types from best to worst
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Wise words Master, unfortunately One has alrd made such a Mistake.
I realized it and decided to tell people this. I started to suck at using mordex because I just used him though I alternated too much speeding it up and I just got too good at the other legends