The best method would be to reduce your access to your bankroll IMO and keeping the coins secure in the same time, keeping private keys in vaults in banks or secure locations would be the best IMO.
If you're already an adult and earning money then this method not very helpful in stopping gambling because somehow they will get the funds if they change mind to gamble again. To come out of gambling one must first mentally decide not to gamble again otherwise they will find ways to play again. After they decide then try not to use a computer for a while when your alone and spend more time with your family and friends in outdoor activities more.