You have a good method to prevent depositing more money every month and I see that you can hold yourself not to gambling until the next month.
Maybe I can suggest splitting the money that you deposit monthly to be used every week so you do not lose all money.
As the Mighty Mike said: "Everyone has a plan until they get punched in the mouth."

The meaning of above quote also applied in gambling when you have this and that plan, but then get zeroed quickly so you have this urgency to deposit more immediately, or
you win so big, and thinking, "today is my lucky day" and play more. The plan is just a plan if the self-control ain't there. After all, we all just a human being.
I think you can play if you can afford it and stop when you can no longer take the losses easily is still the good old mantra.