No one is going to give you 30% of their profits back.
Apart from that, I don't think that you can provide proof of your 10 year career so far and the money you have earned all those years from betting.
What is your betting strategy?
Low odds with system 1 of 5
I can say to you my name and this is proof enough

Later the people want more odds than they have no way not to give us our 30%