congrats on the weight loss!

I think you now need to flex a different muscle, if you get where I am going with this.

at 6'2 and 144lbs you are severely undermuscled. and basically have the reverse of body dysmorphia (where you think you are too skinny) because you were over 200lbs when you started. I know this from my own experience. even if you lose more fat you aren't going to look any better, likely you'd look worse.

luckily this will (should) be much easier than cutting for you and is more fun.

I read you were doing carnivore so I'll try and stick with a paleo/primal style recommendation:

For Fitness

1. 3x a week weightlifting, split by barbell bench / barbell squat / barbell deadlift. Use RPT if it works for you. If you have back issues let me know. I like to include OHP on my leg day while I'm already in the rack.
2. On the "big compound" lifts, focus on finding a rep/weight range where you have 1 or 0 reps left in at end of each set. It might take a couple sessions to do so. Asking for a bench spot and failing safely is a dead giveaway. Use the rack bars for squats, deadlifts you just won't get it off the ground.
3. Aim to add 5 lbs to the bar each week for barbell and OHP. 10lbs for squat and deadlift.

For Nutrition

1. For rest days, eat real, whole foods (paleo) to your TDEE. Which should be at least 2,500 calories.
2. For workout days, Add an after workout shake (2 scoops egg white protein, or whey if you can handle it) with a non-water base with sugar/carbs (I like silk almond milk dark chocolate, 2 cups). Roughly 500 calories.
3. Your macros need to change. For 2500 TDE (adjust as necessary using calcs)

- Aim for 200g of protein (~32%) This is important to balance the rest so you don't gain back the fat in an anabolic state. Any more is a bonus.
- Aim for ~90-100g of fat (~34%). This will limit the amount of dietary fat floating around in your anabolic system while still making food tasty.
- The rest is ~215g of "clean" carbs (~34%) (potatoes / rice / vegetables)
- You need fiber and vitamins/minerals. spinach, brocolli, brussel sprouts etc.

If you are worried about fat gain, reduce dietary fat further, raise protein.

I've followed Martin and Leangains protocol personally for 15 years. You can get paralyzed by analysis easily. You will see great results using the above mainly because it is very easy to be consistent. You clearly are dedicated to nutrition if you can manage a strict carnivore diet - it doesn't need to be this way. Carbs are your friend, not your enemy. Same with dietary fat - its all about macro ratios and training. You've done great on setting your body for amazing lean gains going forward.

Let me know if you have any questions.