Try your best to roam to those lanes that look like they're struggling or they might struggle. First blood? Awesome, back, buy items for stat advantages, shove the wave then roam top and help your top laner. Bot not looking so hot? Coordinate in chat with your jungler or top and coordinate a 4-5 man bot lane.
If you don't get first blood, and instead the enemy gets first blood, try to roam anyways and help out the lanes.
Also communication is hella key. Someone may be on tilt so just talk to them, tell them to play safe and just encourage them.
For me at least it helps that if I get more than 1 loss I go play a normal game to blow off my tilt. If you keep playing Ranked after 3~ losses then chances are you're on hella tilt and perform way worse than usual.
I realize this may not be the greatest advice since I'm a silver pleb but these points has helped me immensely since I've climbed from Bronze 1 to Silver 4. Trying to go to gold by the end of the season too. Hope this helps and good luck :D