Before starting keto have you tried just low carb? Keto is very rigid, I did it for two years and have an athletic build (lift weights and run) and struggled to maintain workouts but you will certainly lose weight. I kept hearing of this great energy that never faded but it just wasn't the case for me. I did, however, get to the point where I felt I never felt hungry which does keep me focused when doing tasks. I felt like never getting to that low blood sugar, the starving feeling can be a huge distraction not to mention low energy due to blood sugar.
I now just do low carb. Very loose with that at times because being on the road isn't the easiest setup for eating clean but I'm ok if I stick to the plan the "majority of the time". Instead of going on a big detailed reply, if so inclined, look up Mark Sission - Metabolic Flexibility. He is the best non BS person out there in this arena and has more info on diets and workouts than you can possibly read.