How do I become a grand champion?

Hello someone is playing on the ps4 rocket league and can help me become a grand champion my current rank is diamond 2. I would be very grateful if someone could help me further.

I'm GC. But it's hard to come to gc with a dia player. If you were chmapion 2 or 3 then it would fit very well ^^

Otherwise, if you really want to be this Season GC. Then you could boost your acc. (Costs a lot, and is not liked when playing with a gc title like a dia player)