Please don't play janna in solo queue
If you are alone in solo bot lane and are below plat elo. TYVM. I'm tired of it. They nerfed janna into the ground and she is a niche support. Don't pick her first especially when Vayne isn't banned or picked. In solo queue its much better to have a Leona/Thresh/Blitz instead of Janna. I can understand it in a Duo. But don't force a Janna on a solo queue player. Just don't do it. Janna and most ADCs do not work together considering a lot of her plays come from communication not the ADC picked. Last game I was Draven with Janna support against Alistar and Vayne. First thing I die to is a lvl 2 all in while janna goes to ward after she shoved the lane out with a tornado. Second death to tower dive because Janna used her q on ali before he even started his combo.
Basically don't pick Janna unless you are really good with her or you have communication with at least 1 person on your team preferably your adc. She has been hit by the nerf bat too many times and is so situational now that I don't think of her as anything else but niche. I prefer Bard over Janna at this point because Bard contributes something meaningful for all comps not just a really specific one.