The ultimate proof against RNG cheating would be increasing your bankroll to an amount that would make an online casino uncomfortable.
So if you started with $500 and turned it into $50,000, I would say that you've pretty much destroyed the theory that RNG is rigged.
Keep up the good work!
Just playing R/B I've been able to take a $25 bank to over $2500 playing RNG on Betvoyager. I use a Labouchere cancellation progression of 11111 trying to win $5 each session.