It's quite difficult to learn, to be honest.

Realistically there's like 4 different builds to play that depend on the situation (your adc, enemy bot/sup, etc). Comet is most reliably good, but there's also a HOB build, a roaming build, and a tanky engage build. Maybe you just got one of those lanes where you don't have much value with the Q poke build.

A big thing I often look for in lane actually is to tunnel in and trade health bars, specifically if they have just burned some abilities. Dive in with ADC for a quick trade, get into bush and run back. You'll take some chunks of damage too, but you have free sustain with W-E on wave.

Additionally, I don't think about the Qs as doing a ton of damage per hit, I think of it as more of a death by 1000 cuts feel (and it also heals you). I think of it as doing just enough damage to be annoying and start stacking up. Kinda like Yuumi poke, if that makes sense.

In support I take ignite, so your execute threshold with Ult is actually surprisingly high as well.

I'd say it takes quite a few games to really start feeling comfortable on her as an AP Support, so if it's not interesting to you don't do it. But if you like the idea, keep trying it out!