I am stuck on creating an efficient line follower with medium motors.
The problem is that the motors are rotating in different ways so I can't use the steering block.
I would appreciate any kind of help.
From a programming perspective I can't help you since I haven't programmed anything since the Mindstorms NXT. The simplest solution I can think of, without seeing your set-up, is to offset one of the motors and add a 1:1 gear drive using 16 tooth gears that would simply reverse the motor output on that side.