This is luckily a problem Dota2 doesn't suffer from, we've been incredibly lucky to have Icefrog be the main force behind it for over a decade. It's an incredibly well balanced game, at this International (World Championships for Dota2) 112 of 113 heroes has been picked and/or banned. The amount of diversity you have in strategy is amazing, there is a meta obviously, but teams have very individual styles and heroes they prioritize.
As far as I'm concerned Dota2 is probably the most well balanced competitive video game out there.
It's also interesting to note that icefrogs balance strategy revolves around strengthening strengths, and making initial weaknesses more pronounced. I think this helps a lot with diversity.
As far as I'm concerned Dota2 is probably the most well balanced competitive video game out there.