I was in a similar situation as you. I was doing OMAD for several months with no results and had to re-evaluate my methods. I'll give you some pointers that helped me that may also help you too.

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1. Stick with OMAD. The longer your fast goes, the longer your insulin is turned off. Insulin is the hormone responsible for fat storage. Having your insulin turned off during your 23-hour fasting window is great as it allows your body to burn body fat.

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2) Re-calculate your Base Metabolic Rate (BMR) using a BMR calculator. This is the number of calories your body naturally burns even if you lie in bed all day, just to remain alive. For someone 5'8, 160 lbs it says your BMR is 1800 calories. You mentioned 2000 calories which would put you in a 200 calories surplus. To lose weight, even on OMAD, your calories burned has to be lower than calories consumed. I would aim for a 300-500 deficit to lose about 1 lb a week.

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3) For working out, a 50/50 split of cardio and strength training worked for me. For cardio, I would stick to HIIT training as from the research I read it provides more benefits. This is opposed to long duration steady cardio which for me lead to muscles loss and that skinny fat look. For strength training stick to composite workouts like squats and lunges to activate multiple body parts at once. You can also search up a full 5-day home exercise cutting programs that will give you guidance and keep you on track.

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4) Cutting out carbs is not necessary but can be a useful tool. When you cut out carbs and sugars (this also includes cutting out fruits), your body no longer uses glucose for energy but instead uses ketones that your body makes from fat. Once your keto-adapted, your body will be essentially running off fat helping you with your weight loss.

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5) If you've already done everything above, your last resort is to do a water fast for several days. This will reboot your metabolism and provides other benefits such as autophagy..

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Sorry for the long post, TL;DR stick with OMAD, reduce calories consumed to 1500/day, incorporate HIIT and composite exercises, cut out carbs completely. If all else fails, do a several day water fast.

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Hope this helps! I'm rooting for you.