To compensate for the loss in calories from carbs (if you have cut your carbs), you have to increase the calories from the only two other sources - fats and protein. I was able to add a few pounds and then stabilise mainly by adding extra eggs and cheese, plus butter. It was a tricky balancing act, and took me several weeks to find the right balance, but got there in the end. That was over 3 years ago and I have maintained ever since.
It is not a good idea to increase fats unless you are low carb. Carbs plus fats is not at all wise.