Crucible needs better loot, more often. In all game modes. Loot that is actually desirable to chase.
There are exotics that are locked behind PVE and raids, there should be good weapons and exotics for PVP as well. Doesn't have to be overpowered, just on even ground with the rest of the game.
Balance is good, but fun is better. Fun shouldn't be sacrificed for the sake of balance.
And don't penalizing players for being good. Example, nerfing the performance of shooting while sliding or jumping. If you can hit a moving target while jumping in the air, then good for you!
Widen the skill gap, that will give players a lot of room to grow. Players will gradually develop in their crucible journey. They're ups and downs but enjoy the growth process. As players practice and gain experience, they're efforts are rewarded.