Actually, Charles did answer you in a way: it would not be easier to drop lean and fat mass to reset your body and then build from there. If you "reset" to a low weight and try to bulk back up, there is a good chance you'll add the fat back as well.
You asked for advice, and you got it.
You didn't care for his, so here is mine, but please note, I'm not one of the big dogs around here, so how good the advice is is up for debate.
What you are thinking is not impossible, but I wouldn't think it optimal, either. Nor the easiest way to go about it.
I appreciate where you are coming from, though. I, too, have an easy time adding muscle mass and increasing my lifts. My problem is that I have a hard time doing so without gaining unwanted weight.
As such, I can understand a certain lack of care about losing some muscle mass, but a complete disregard as to the type of mass you are losing seems...reckless. And yes, there are cases in which losing muscle mass is desired, but it doesn't sound like you have that sort of goal in mind.
In my opinion, an IF diet is not going to break down your muscle mass (this from someone who has had some success on both Eat-Stop-Eat and Leangains style IF). You say you have a 1900-2000 cal daily intake, which makes me think you are leangains or warrior diet style. If not, best to look a weekly average since E-S-E will vary your dailies.
You cal intake is not super low. Having experimented on myself, I tend to not lose much if I'm not under 2000 cals as well, but it doesn't sound like you want to drop this to an extreme, like sub 1000 a day.
Doing a form of weighted cardio--which it sounds like is what you want to do--is likely a good option, and I doubt you'll lose a lot of muscle mass doing so. You will likely lose strength, but that's not the same.
It sounds like you are also adding a lot of low intensity cardio--but you didn't mention type. A "ton of cardio" isn't very descriptive.
If you are spending a hour or more doing straight low-intensity cardio every couple days, you should really keep to some heavier lifts for more muscle retention (but not necessarily growth). Keep it intense and heavy--very short rest intervals, compound lift: deadlifts, squats, pull-ups, and bench presses. Maybe keep it to a full body routine 2 days a week. If you are doing very short rests (30-60 seconds), you won't be hitting 1.5x BW deadlifts, I don't think.
The cardio can burn a lot of calories, but the low intensity keeps it a kind of "easy day" to recoup a little.
If you are spending time doing high intensity cardio for short periods (google High Intensity Interval Training or HIIT, and check out weighted complexes
), you might want to keep the weights lower and make them faster pace as well. A boxercise or circuit plan would be fine.
In this set up, push the HIIT or complexes really hard, and have the circuit training or boxercise be the "easy day."
Note that you should incorporate one day in which you don't do too much of effort and really get some rest. Also make sure you are getting enough sleep. This sort of intensity could leave you drained, sick, and just feeling like crap, especially if you keep the cals low.
Diet is like 95% of dropping pounds, though; my big, big advise is weigh and track everything you eat and keep adjusting the amounts so that you stay in a good zone for you. Noting how you feel eat day, even what you are craving to eat, can be useful and important information to keep you on track!
will reinterate that this might not be optimal, nor is he the best person for advice-giving.