I'd suggest finding a club that does volleys on a regular basis. You will make cash pretty fast that way.
Although, I'm not sure how often volleys are being done right now.
However, never spend all of your money on upgrades. I suggest always doubling what you need, so you always have cash left over.
You only have 490 mill? I had 1.7 Bill at 14k stats and Nobody helped me volley! Ever Then I upgraded And now I'm Beast ! Spent 400 mill on clubs 300 mill on Drop Volleys
And I have 238 Mill ATM lol