If you're not duoing with the support, and don't want to risk it, I'd recommend shooting for ADCs that aren't as reliant on their team peeling for them. I really like MF, but I'd probably wouldn't play her in solo-q because she has zero escapes. I suggest picking up Ezreal (an all-around safe pick) or Lucian, Caitlyn depending on how you play her.
Look to help out mid whenever you can, especially if they're struggling. A fed enemy APC is bad news for you.
Make sure you and the support are on the same page before you even get to lane. If you want to play passive or aggressive and/or when you plan to shift between the two, communicate that to them.
If you're dying to the same enemy champion every team fight, don't try to keep building glass cannon and out damage them. If they have a fed LB or APC pick up a Banshee's. Randuins or earlier GA for assassins. Building damage means very little if you can't live long enough to dish it out.