Use another book - not owned by
Bookmaker.
Seriously - if you have deposited 25k with a book - but don’t understand why a book would choose to limit your action or or arbitrarily bump your limits - that’s a problem.
JustBet is targeted at recreational players and offers a bonus towards those types.
Bookmaker in general will offer higher limits - and with a smaller bonus. Same ownership - different markets.
If you need another book - I’d suggest
BetOnline - again variety of options and high limits on par with Bookmaker and similarly they own Sportsbetting.ag as a sister site.
Bet105.eu is a relatively new entry into the market - touting they offer simplicity and high limits and welcome winners. So far - so good for me.