I have a rule to no longer contact her on Friday + Weekend time because that is her family time. I also have a rule that if i'm going to cancel, it has to be by Thursday because she doesn't charge me if it's like Saturday, but it makes me feel like i'm taking away business from her.
I had rules not to talk about self harm/sui with her anymore but um...that rule got broken pretty much the very next session after the rule was made.
Add: I also made a rule to stop being a coward and "writing" things to her (including in session) and to address them vocally. This has probably been the most beneficial rule I made for myself.