Farm until kraken slayer then you can kill. or if you are playing top yuumi and they have mr runes then you can try and force them to do a lvl 1 recall by surprising them with your damage with dorans blade and your e steroid

Just freeze wave and focus on farming, this should be particularly easy due to your low base ad. Only look for poke with your passive to gain extra sustain with your e and only engage when your jungler is ready to gank or your support can 100% get you out alive because you DO NOT WANT TO BE BEHIND. You can easily gap close when your jungler ganks you by w to them then follow up

Play aggressive with kraken slayer as you have your e to out trade and exhaust but watch out for mana issues. But your main objective is to farm and keep someone with mobility near as your escape car (yuumi w)

Generally you only want to fight if you have your passive up and full mana as the attack speed buff and healing may throw off opponents. And don't go in alone, make sure to have everyone peel for you