Alcohol and sugar cleanse?

No.
Not me.

Reducing your sugar intake could be benificial if you think you are eating too many sugary foods ( I assume you are eating sugar in foods or drinks, not by itself) and your diet is not nutritionally balanced or you want to reduce calories by swapping for low sugar alternatives or you have trigger food issues or medical issues.

And of course alcohol is fine in moderation - but reduce it if you feel your intake is above that or you just want to be alcohol free for whatever reason.

Neither of the above apply to me - I eat sugary foods in portion controlled amounts and I drink alcohol in very moderate amounts - but they are good aims if they apply to you.

I wouldn't term them cleanses though.

If you feel like maybe you're leaning too much on alcohol, many people do find they have better energy and mood cutting it out. It certainly can't hurt to try. As Lynn said, if your alcohol consumption is high, cut back slowly and check in with your doctor.

There's really no need to eliminate sugar, unless you are eating so many sugary and high cal foods that it's pushing out other foods you need.

I always find a positive goal is far easier and more rewarding than a negative one. Why not pick something beneficial that you're shorting and make a goal for working it into your daily diet? Like focus on getting 5 servings of veggies, or hitting your fiber goal. If your diet is too high in sugar, that sort of goal will probably naturally push the excess sweet treats out anyway.

I found I felt better when I started watching my macros. I was almost always low in protein and fiber, and sometimes low in fat. Balancing out my diet by focusing on increasing the stuff i was lacking was key.

Give some thought to your sleep quality too, we often don't prioritize it enough. Good luck!

Alcohol is a natural depressant. The last thing many of us need, especially as we're dealing with the pandemic while also trying to change the eating and exercise patterns of a lifetime, is a depressant. You wouldn't want to take a depressant pill if the doctor gave it to you. Drinking is a way of self-medicating with a depressant.

It may seem counter-intuitive to think of alcohol as a depressant since we often drink it to improve our mood and it can do so very short term by depressing and impairing our brains. This removal of inhibitions can lead to short term mood improvement but it doesn't work long term or when alcohol is used to excess. Things alcohol does to you like mess with your sleep patterns and making concentration on tasks harder can lead to emotional depression.

So, dump it. I did and I don't miss it.

I tried jellybeans soaked in vodka for 24hrs on the recommendation of my children.....
Not impressed, a waste of both jellybeans and vodka.

More seriously....
From personal experience managing the symptoms of stress has never been particularly successful - tackling and managing the root cause on the other hand has been.

Without knowing the level of your alcohol consumption or the form it takes makes it impossible to judge the effect of eliminating it.
There's a world of difference between moderate consumption in a social situation and self-medicating with excessive amounts (did that and elimination for a while was necessary for my mental and physical health).

Not seeing why you are picking simple sugars? What exactly is it that you think adds to your stress level from consuming sugar? Especially when you report less energy for your workouts cuttng down an energy source seems an unusual choice which I'm not understanding.