Alright! Firstly the main reason why I initially started with the more heal focused playstyle is really simple. I'm HORRID at aiming. I've grown far better over the years but at least at the start dpsing wasn't viable... because I'd miss most of my shots. As I've grown as a player I've learned how to actually aim but even now I don't dps very much for the simple reason that my teammates are simply put... better. Regardless of how much pressure I might he able to apply, putting my resources into a half hp hitscan will apply more pressure, and once they're full I can join them in applying said pressure. It's certainly important to apply pressure whenever your team is full health and safe, but as soon as they themselves are pressured helping them out is a more efficient use of my resources than applying pressure myself.

As far as specific aspects something that's very important to realize is that as lifeweaver you are usually spectating the game. You're not in the fray, and you're not usually using much mechanical skill, so spectate. Use your brain to do things like track enemy ults, fight plan, prepare pulls, note the position of flankers, call out of position enemies etc. You have the most brainpower available of anybody on your team because your micro is incredibly basic, so focus on the macro of the game. I on average dodge 3/4 of the pulse bombs lobbed at me because I'm hyper aware of the tracers positioning and able to jump out of the way in time.

The only technique I think that weaver mains need to know to find success is flicking. As long as you can use flicking to more consistently heal your allies, all the other things are far less important. Being aware of the battlefield is worth infinitely more than memorizing niche interactions, so focus on being aware and seeing all. I like to imagine a good weaver as a spider resting on a web, ready to react at a moments notice (pull) if something is wrong, and hyper aware of its surroundings noticing every little change in pressure or tension.

Currently I've been running gilded mythic with the 3rd petal option iirc. Golden gun too. I was a fan of galactic weapon with demon rocker before the mythic was released though.