10-20 per week is quite a lot.
10 craft beers (330ml bottles) of 6-8%ABV seems a bit too high if it’s every week. 10 large bottles (500ml) is worse and 20 of anything is very high consumption IMO.
I’d sometimes have a couple of drinks Monday to Thursday but that would be the exception - maybe a glass of wine with dinner, or perhaps 1-2 beers watching a movie. Occasionally I’d have quite a bit more at the weekend if I was out with friends or whatever. But a couple every night is a dangerous habit. I used to drink a bit more. Often 2 or 3 glasses of wine or a couple of craft beers a few nights a week, but I realised the number of nights was increasing gradually so I decided to avoid drinking on Monday to Thursday nights in general. I didn’t find it difficult, it was just a habit that needed breaking. To be honest I probably enjoy it more now that I indulge less frequently.
I’m amazed that your doctor is fixated on 19g of sugar a day but not bothered by the alcohol. They have many similar effects, and at that quantity I’m pretty sure the alcohol will be much more relevant.
I’d be more concerned about general long term health, but if athletic performance is a concern, cutting back will almost certainly make a significant difference. Alcohol isn’t great for your heart. It also contributes a lot of calories to your diet that tend to manifest themselves as fat. If you are at all overweight, cutting back should make it considerably easier to hit race weight. You’ll also get better rest and generally feel better. Alcohol interferes with proper sleep. You may get to sleep, you may even find it easier to get to sleep, but the quality suffers. Also alcohol is a depressant…
If I may make a suggestion?
Cut back substantially for a few weeks and see how you feel. At the very least you’ll prove to yourself that you can cut back. If you can’t there’s a more serious problem than sports performance! If you feel better and start performing better, you can decide whether you want to go back to what you’re doing now. It will of course take longer if you’re planning to reap the rewards in terms of body weight. Either way, cutting back should be beneficial for long term health.
I love wine and good beer and I’m not planning to give them up. However, I do think it’s wise to keep them in moderation.