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.
you are right, when we are easy to get money easy also to occasionally back into gambling. but for me it is not a problem, when I only get free money to play gambling. If it is difficult to stop, it will come naturally, when we got bored playing gambling after several years and you never get the results, I'm sure you will stop when it finds things that are better than gambling.