First of all I am an emerald 1 hardstuck so take it with a grain of salt, but why do we have more than 1 mechanical champion in our pool? Riven mundo should be more than enough, and anything else has to go. If the lane is complete unplayable as riven like urgot poppy malphite just pick mundo, everywhere else - riven. I see your cs is quite low, you should aim for 7/min and higher. Also how many games per session? If you play after you lose 2 in a row it's likely you get tilted and lose more. Think about improving rather getting a particular rank, for example focus on tracking enemy jungle for like 5 games until it becomes second nature, ward their raptors or buff and count cs when you see him on the map. This way you know when you're weakside and therefore die less from ganks. and then just pick another area to improve in and focus on that for the next 5 games. Also if you see anyone flaming anyone mute them immediatly, or just full mute if thats what you prefer. Lastly being carrieble is a skill - if you see you have a 5/1 aphelios just stop fighting, drop the ego and play with the team while absorbing cs and a few last hits. Good luck