You can use Reveal's events into Klaviyo by creating segments which add customers automatically based on certain metrics, such as a change in the RFM Group. Below, you will find the necessary steps to create such a dynamic segment.

Step 1:
In your Klaviyo account, go to Audience > Lists & Segments and click on "Create List / Segment".

Step 2:
In the next screen, select Segment to start setting up the conditions based on which you need to segment your customers.

Step 3:
Name your segment, then select the condition "What someone has done (or not done)" and set up your metric (e.g.: "RVL RFM Importance Decreased" > "at least once" > "in the last 30 days"). Don't forget to click on "Create Segment" after you are done defining all the conditions.

You can go even deeper in segmentation and include in your definition which is the current RFM group and which was the previous RFM Group:

You will be redirected to your newly created segment, where you will see all customers corresponding to the set conditions.
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Note:
Please take into consideration that there might be a slight delay when updating the segments in Klaviyo. For more on this subject, please visit this Klaviyo article.

Here's a quick video tutorial as well:

Next, learn how to use this segment in a Klaviyo Campaign or a Klaviyo Flow.