why not try a different sportsbook?
If the Op is a real one then I think the user will be limited if the user started on a new site. Usually who plays and is limited the person become limited for the same reason and I think the bet figure is impossible.
OP can always find a workaround to keep gambling. If his name is already restricted on major sportsbooks, he could ask trusted people to register on his behalf, skipping the forums and going directly to people he knows so he can explain everything. It sounds a bit suspicious that he’s been limited on popular sportsbooks, but for the sake of discussion, that’s the only suggestion I can think of right now.
To me it is very suspicious he comes here claiming he has been limited, when there are influencers and rich people on the internet/social media who are famous to show off their millionaire bets during important matches, for example during the football world clubs. What would be different from OP in such a context?
When comes to bets, the casino benefits from volume of bets and from the liquidity in their markets, so it would not make sense for them to limit OP (unless the casino itself had a stake and it is opposite to the one OP had).
Anyways, assuming he is being serious and actually want to be able to have millions in a single stake, he could try to about crypto casinos and go to physical betting agencies for high rollers, there they are less likely to ask for KYC and, since he would be surrounded by other high rollers, he would not stand out in such crowd .