The amount of protein/fat one needs to eat is dependent upon how much lean mass and fat they currently have. There is no requirement whatsoever on keto to maintain a strict macro-nutrient ratio, as others have suggested in here. Also, there’s only ‘x’ amount of fat than can be utilized for energy from stores so exogenous fat intake needs to at least be enough to cover the rest of the body’s needs.
And yes, you are much better focusing on one goal first than multiple goals at the same time, and this is exactly why the bodybuilding community cut and bulk in cycles for the best results. Simply put, if you are trying to focus on two things at once, neither are getting 100% of your effort.
The best thing someone on keto can do is to lose the fat, get down to a more healthy body fat percentage whilst ensuring their protein intake is sufficient enough to retain as much lean mass as possible, doing light exercise such as stretching or resistance band work, before re-evaluating and adjusting their goals.
If you are carrying a huge amount of surplus fat, and you start lifting or working out, not only are you putting your body under a ridiculous amount of stress during each exercise performed, but your body also switches it’s priority to recovery, especially if lifting and muscle fibers need repairing. You also risk myofascial injury, and could even lead to spinal injuries which can be exacerbated by things like anterior pelvic tilt (APT).
Doing such exercise with a huge amount of weight is a good way to end up with very serious health issues such as a bulging disk in the vertebrae or a hernia, not to mention that most people who are overweight will not be able to fully engage their core and perform exercises correctly, as they will not be able to ensure correct firing of the abs, glutes, and will most likely have tight muscles in several areas.
You can keep your fat levels low because it’s not a goal like the other macronutrients. It’s a maximum intake. Protein is a goal because you need sufficient protein to retain muscle mass, but if you have sufficient fat stores (i.e. you’re overweight) why would you intake a high amount of exogenous fat? There is no point whatsoever.