need gameplay help

folks, how do you keep your damage high in this game?.

I really struggle to like stomp lanes hard and i dont know what to do when im not able to stomp and breaking even.

i love renekton and darius but i feel extremely pressured to make plays.

i climbed the plat 3-2 and now people simply don't fall for me knowing my champ better and picking fights. when i trade with darius and reketon i notice i push my wave too hard and just end up shoving under tower and letting them scale.

any advice?