Just a suggestion, but I think it would be nice to make Lifebloom, Rejuvenation, and Regrowth useful. Not only in PVP but PVE content as well. Wild Growth is for sure a great addition, but the mana cost also means it can only be used sparingly.
Rejuv is basically useless, and is not mana efficient, neither is Lifebloom. Resto Druids just use Starsurge instead of Lifebloom because it is not worth using.
My suggestion would be to increase HoTs healing significantly (all of druid hots, except maybe Wild Growth), and maybe reduce their mana cost as well, depending on how much of a buff they would get. Lifebloom mana cost should be reduced by at least 30% and consider increasing healing slightly for Lifebloom as well so it is comparable to penance for Priests.
Another suggestion to make Lifebloom good is to have it apply 3 stacks at once (with one cast). This may make Lifebloom better, but I still feel hots are a bit behind because of the amount of damage people are doing in PVP. But this also could help Druids in PVE content as well, and not just rely on Wild Growth and Healing Touch.
One suggestion for all casters, and this may be a hot take, but it is to remove pushback for all casters in PVP. Classes already have kick/pummel, and other interrupts. Druids particularly do not have a way to avoid pushback, unless you put talents into it, which is not really worth the talent points, and we do not have Barksin. Because our hots are useless (outside of Wild Growth) we’re forced to cast 3.0 second Healing Touch, but that turns into 4+ second cast time with pushback. Sure Fury rune gives us an instant cast sometimes, but this is very inconsistent and not reliable. The idea of Nourish is good, but to me, the point of it is to account for burst damage when the HoTs cannot keep up. However, the HoTs cannot keep up with much damage anyway, so that means we are just putting a hot up to make Nourish better, making the whole thing in my opinion worse than just waiting 1.5 seconds longer to cast a better Healing Touch.
Maybe if resto Druids could use hots again, we would see a lot less Balance Druids in STV.