Progressively increasing the bankroll - risk of being limited?

So i have progressively increased my bankroll with each profit i made as i do not want to withdraw any money until i have been limited by the bookies. I have started from 2.000eur and am up to 4.500eur bankroll.
In terms of risk of being limited, what is a more long-term solution - keeping it 4.500eur (or any other level) constantly or increasing it further to 6.000, 7.000, 10.000 as i go along?
I would not be doing any withdrawing in both scenarios.