You have to understand how tolerance works. In the most basic terms it’s like this:
As you take Kratom daily you have to take a little more each day in order to feel the same effect. This is because you are building a tolerance.
If you want to reduce your tolerance, you have to take a little less each day. If you don’t already have a high enough tolerance to feel withdrawal symptoms, then you can just take a break for a few days or a week to drop your tolerance back down.
Since you’re asking this question, I assume you already have a tolerance. A lot of people use what’s called a taper to reduce their dose slowly over time so they don’t feel sick.
A quick Google search brings up a lot of information about how to do this, such as this well-written article: https://www.kickkratom.com/blog/kratom-taper-guide/