PSA: If youre standing at a KD like 0/5, dont try to snatch kills
Instead, focus on assisting your (potential) fed teammate (if you dont have one, then it'll be hard for your team to have a comeback). If you are 0/10, you are worth exactly 50 gold. Get one kill and your bounty will be reset fully, and since you wont be a lot stronger with 1/10 (especially if you only killed the 0/5/25 support), you will probably still die quite a bit and thus feed more gold than if you had left that one kill to an ally and grabbed the assist gold. Just try to help your team get kills with your utility and CC because you wont be dealing a lot of damage without items.
TL;DR: Dont play carry if you feed; instead, switch to support.