Welcome aboard Dan! We're here to help. You can go back to keto and then transition gradually to carnivore from there. Or you can jump in head first. There may be some jiggery-pokery with the adaptation symptoms for the first few weeks but they shall pass. Basically, eat fatty red meat (with low carb veg if you choose keto) until you are comfortably full. Enjoy 3 meals a day (or 2 larger meals a day) and avoid snacking. Don't restrict calories. Aim for 1g of fat (or more) for every 1g of protein. If you opt for keto, don't fall for Big Food's fake keto products. There are no such things as keto bread, keto tortillas, keto cookies, keto protein bars, etc. If a package at the store says "keto" on it, it's probably not really keto, lol. Avoid grains, refined sugars, and seed oils - the unholy trinity ;)