If you tolerate heavy cream, that's my go to.

Your weight is in pounds, right? I sneaked a peek at your posting history, because whether you're doing keto to lose weight or for some other benefit--like maybe you just feel better, more energetic on keto or something, sort of matters for the question you're asking.

I originally ate low carb for weight loss, but ended up eating higher fat, ketogenic because it seems to help with my bipolar. So when my weight is closer to the lower end of my range, I sometimes will use fatty coffee to keep my calories up.