maybe a solution is to be able to concentrate on as many spell levels as is spell level of your highest spell slot.Playing a hexblade warlock, there's a lot of spells on my list that don't end up getting used.
Part of it is the pain of Concentration being a little too limiting. I understand its in place to prevent the excesses back in 3E, but sometimes it's just a bit too constraining, and in some cases (like 2014 Barkskin) silly and punitive.