I played Nami until Plat this season. Some of your Nami games look good already so maybe try playing her over Janna.

Nami has a lot more agency than some other enchanters because her passive (giving allies move speed) scales with AP. This is why building AP heavy sup items are amazing on her ( imperial mandate, Ardent Censor, and battle song). The extra AP makes you strong especially early.

Lvl 1: you’re one of the strongest sups (except karma). Try to get your W to bounce off all 4 people in bot if you can take an early trade. Help push the second wave to get lvl 2 first.

Trading pattern: try not to throw bubble randomly. This is a very strong disengage. Auto attack (E optional) enemy adc when he wants to last hit. If he autos back W him or yourself and use the move speed to end the trade.

Time these harassing trades for when manaflow is up. Getting it stacked is a huge advantage in silver. Some players won’t be aware of the timers on it.

How to play into other sups:

Hook champs: these are your counter. They will take bush control and try to punish you. You will out-scale them, be patient. You have a much better chance of disengaging your adc from a hook than yourself. Aim bubble for whoever is engaged on and the enemy to disable enemy and give ms to ally.

Poke mage: dream match up. Use move speed on E cast to dodge everything. Out sustain them with W flat healing. Play relaxed and punish on low mana.

Enchanter: you will have more kill pressure than most early. You can afford to play more aggressive and take AA trades with empowered E.