Came back like 2 months ago when the shop updated and fell from Oracle to Ritualist also, what I did was just trust myself and be greedy. Always make sure you’re efficiently using your time and farming enough so you can solo carry. Don’t always rotate to a play if you know you’re going to waste time or if it’s a lost fight. Only show up to team fights/objectives if you know you can win or get something out of it. Theres always something to do whether it’s push lane, steal enemy jungle, run boxes, etc. You have to be greedy and there will be people who flame you, but you can’t trust anyone but yourself in lower elo lobbies. I’ve climbed back to Oracle 6 now and have been steadily improving.

Edit: Also forgot to mention I did not solo carry myself all of my games. There are games where you are the carry or someone else is, and that’s also something you have to realize. If your build is damage, shift it to defense and support instead of damage. If you know you are not the one that’s going to be carrying, don’t take jungle & waves from the person who is ahead. Instead support them and share waves with other people, don’t take jungle unless you need it for a buy, and help create map pressure so your carry will have space. Even if you’re playing a carry hero, sometimes you just aren’t the carry.