Start by floating the idea by the people paying you. Your situation and the people in your life (clients, partners, etc) are not going to be the same as everyone else so it's not going to be very relevant to your specific situation. Try transitioning rather than starting from scratch. Perhaps it's better that instead of working 2 to 3 days a week, you're working 6 months out of the year. Try going down to 4 days a week, then 3, then 2, etc. The less drastic the change the more receptive people will be to it. It's also going to be better for you as you'll adjust to the new work schedule and income over a longer period of time. You mentioned cutting expenses, just do that, you don't have to ask anyone, less expenses will make the transition easier and is never a bad idea.

You should be prepared with the concessions you're willing to make to make this happen and this will likely be asked when you float the idea.

Also, consider that you've moved up Maslow's hierarchy of needs and re-evaluate a lot of things in your life that may no longer be relevant. I'd bet you're transitioning from esteem to self-actualization. This could make cutting expenses much easier than you think it is because you no longer derive much happiness from materialism.