Another one that could be good and even better is saying how much money you are willing to spend today and if you get to the set amount you could stop it since you already had your fun.
I once met a millionaire girl who got addicted to gambling but she could get out of it and she was ok the last time i spoke to her.
i tell you what . i already tried the methods that you laid above . first is limiting the time that i will spend . i said to myself that i will now limit my time because i have other things to do and they are more important but during the session it seems that my plan didnt work because im still get hook and cant control myself .
other is having enough money to spend as bets . i did also try this but after i loose i cant easily accept my defeat . i then borrow again some cryptos on my wallet to revenge .
oh well , the only one that can stop me gambling is when im totally busted and if theres no electicity or internet available to connect to online gambling sites .
its hard to control the addiction but time heals as they say .