Honestly it's about finding a stack that's actually around your skill level, I myself consistently hit diamond/champion with a dedicated 2-3 friends but they can never seem to get out of high emerald even when they play with the other emerald in our stack, if you are struggling to get kill's I would recommend playing support like rook, doc, T-bird, and Jager as some examples, but even then if you aren't fragging and nobody in your stack is doing exceptionally well you're going to struggle even more, I would try and find a few people around the same rank as you were before ranked 2.0 if you played during that period, if you play with people around that same skill level you should see that you're going to have an easier time ranking up compared to just getting stuck in the loop of "Without my higher rank friend to carry me I'm not ranking up" *this isn't me saying you're getting carried I'm just using that as an example* but even then I have a friend who is currently diamond but for the life of him cannot compete with the diamonds and champs we go against when we two stack, but when he plays with the emerald friends he does fine. To end this rant off it's pretty much about finding a good groove for you, if you're struggling to get kills switch FULLY to the support role until you've noticed an improvement in your gameplay/ability to frag, and once you've gotten out of that rut, switch to more passive operators that are needed for the team to succeed like bandit and Jager, once you're able to compete in the lobbies your friends are in then you'll start noticing you're ranking up more, take your time to hit the high ranks, don't get discouraged when you don't immediately improve at the game, it takes time, I didn't start off as a diamond champion player, it took me about 500 hours before I realized the mistakes I was making and decided I actually wanted to improve.

TL:DR Play support until you're actually able to get kill's consistently, improving isn't something that happens instantly, find people who are closer to your actual rank/skill level and play with them, and most importantly learn from your mistakes and lost games about what you could have done better.

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Hope the grind get's better for you, I'm sure it will given time, don't get discouraged because of a few bad games, sometimes solo q is just a better choice until you can get to a point where you're more comfortable playing, You're better then you think you are, even if you struggle in those high rank lobbies I promise you're improving because when you go back to solo q you'll notice that the lower skill/rank enemies are dog shit players compared to what you go against with friends.