I’m 208 when spec’d into Resto, also nothing top tier.
You should totally stick with Resto! There’s some good advice in here about how to improve your legendary/talent set up. Like, the first time I used Flourish I was shocked at how good it was. How had I not used this before?
I immediately shelved the double lifebloom legendary (even though it’s fine) because it was reassuring to me in a dungeon to have such a good AOE cooldown.
Sure, Resto isn’t S-tier for M+ anymore, and we get a little outshined in all content. But we’re absolutely solid and the more you pay attention to what actually gives you that oomph in M+, it will be easier. The HoT playstyle is fun but admittedly pretty dependent on tuning/borrowed power. Even still, Resto is the most fun I’ve had playing WoW.
I’d say: keep doing your research, keep practicing, and keep thinking why this good player plays X talent in Y situation or uses Z legendary in their keys. Over time, you’ll get the feel of why Flourish is often superior to Germination. Some things are easier to make good use of and pack a punch. Like, why choose the less effective and more difficult option when you could just pop Flourish once when you’re in trouble?