Picked up a long term contract a couple of years ago, started out with 20-30 hours/week and has tapered off a bit as they transitioned from bootstrapped to vent

Picked up a long term contract a couple of years ago, started out with 20-30 hours/week and has tapered off a bit as they transitioned from bootstrapped to venture funded and hiring full time devs. I mostly do one off must haves for them these days as I've moved on to other things. Best way to handle such clients is to be available, adaptable and competent.