Hello Yawza, Ben here - your Shopify Guru!
You can do this by applying two filters to your customers. From within your Shopify admin click on customers. Then add your first filter:
Then you can simply apply a second filter with the following settings:
You will then have your customer sorted by 4 orders or more and having placed an order within the last 90 days. If you did this correctly the you will see the two filters displayed like this:
Alternatively you can click here, to load the two filters in your customers section.
I hope this helps! Feel free to reach out if you have any further questions :)
Ben Czegeny - Shopify Guru