I sympathise OP, and I was you by June last year, not all lockdown induced, but lockdown on top of creeping sloth and snacking.
Work out what works for you.
I wanted to adjust my diet to a sustainable ongoing habit. I stopped buying snacks, biscuits etc. Adjusted my food portions and chose lower calorie meals. But not ‘diet’ meals if any kind.
I also started exercise. Even a bit made me feel so much better about myself. A brisk walk counts.
Once you have made an investment in yourself it is easier to see the effort as giving yourself something rather than taking something away.
I have lost 12Kg since the beginning of June, and it hasn’t been tough, once I kickstarted myself.
Also the ‘no point til after NY’ is a fallacy. Getting fitter and leaner is a long game. I have had some real ‘OMG, did I really just eat a 4 pack of Twirl Bars?’ Days, but in the old days that would have been on top of other stuff. Now it simply represents a standstill for a day. I will no doubt eat loads over Christmas, but so what, so will millions of people who manage to maintain whatever weight feels good for them overall.
You don’t have to aim for perfect, either. Modest achievements can make a big difference.
Good luck, OP!