The spices of ranch are garlic, onion, chives, and dill. Depending on what I’m using it for (dip or salad dressing) will determine the ratio of mayo to coconut milk - more mayo to keep it thicker for dip and more coconut milk to make it more pourable. Then just add the spices to taste and salt if you need it. If you need a little tang, add some ACV or lemon juice keeping in mind that the vinegar or lemon juice will thin it out a bit depending on how much you add.
Sometimes I’ll add bacon grease or bits (or both) or some avocado/guac for something different.