A page about withdrawing money quickly has an obligation to say the other thing plainly: for some people the fastest useful withdrawal is the last one.
If you need help now. The National Council on Problem Gambling operates a free confidential helpline 24 hours a day at 1-800-GAMBLER, with chat and text at ncpgambling.org. Gamblers Anonymous runs in-person and online meetings at gamblersanonymous.org. Both are free and neither requires you to have decided anything in advance.
Signs worth taking seriously. Betting more than you planned to and doing it repeatedly. Chasing a loss with a bigger stake. Borrowing money to gamble, or gambling with money set aside for something else. Hiding how much you play from people close to you. Feeling you need to gamble to feel normal rather than to enjoy yourself. Cancelling a withdrawal you had already requested in order to keep playing — a habit this site writes about as a payout mechanic and which is also, honestly, one of the clearer warning signs.
Tools that work. Deposit limits are the most effective single tool, and they work best set low and set early, before a session where you might want them higher. Most operators offer session time reminders, loss limits, cooling-off periods of a few days, and self-exclusion for longer fixed terms. Offshore operators are not uniformly good at honouring these, which is worth knowing when you choose where to play.
Beyond the operator. Blocking software such as Gamban and BetBlocker covers gambling sites across your whole device rather than one at a time, which is more robust than relying on individual self-exclusions. Your bank may also let you block gambling transactions outright.
For family and friends. Gam-Anon supports people affected by someone else's gambling, and the NCPG helpline takes calls from family members too. You do not need the person gambling to be ready before you get support yourself.
Never gamble with money you need. Never treat it as income. If it stops being fun, stop.