Here are just a few suggestions:
Give some more important function to Reliability and Cooling because practically no one develops these attributes of the car because it doesn't have much use and almost doesn't affect the car.
Another thing, when we play on the desktop/computer and go to the car search, the team that has the most points in this attribute appears, why not do it on the cell phone too?
I also think that they should add other types of development such as the chassis of the car, and those who have an account above level 20 could also develop the electrical part of the engine (whether with engine points or in other ways)
I also think that fuel suppliers could also be controlled by players, so it could have its own fuel characteristics, efficiency, weight and other things that differentiate the pace of the teams in the race