I call this subject "Triple A". Alcohol and Anxiety.
Why do I bring this up? Many people who suffer from anxiety could seriously minimize their anxiety, or perhaps cure, if they stopped drinking. Alcohol can suppress anxiety when one is intoxicated, but the results of it the next day can worsen your anxiety symptoms.
And motivation? Don't get me started. A hangover is not a good image when you're working on improving your "motivating abilities".
On the other hand, I do believe that a little bit of alcohol every week (or even every night) is not only not unhealthy but could perhaps have benefits to it. This does however, depend on the type of alcohol too. Such as red wine vs vodka.
Now, going back to alcohol and anxiety, here's what alcohol does to your anxiety: according to this healthline article, "Alcohol changes levels of serotonin and other neurotransmitters in the brain, which can worsen anxiety. In fact, you may feel more anxious after the alcohol wears off".
Notice the last part. Just like I mentioned in the beginning, the next day, your anxiety symptoms are perhaps worse than before.
Again, I don't think a little bit of good alcohol (quality, source, etc) is bad. I'm just talking about binge drinking, and drinking to the point that you can't go without it (alcoholism).
So, next time you go to a party, or out with someone for drinks, ask yourself "is this the best part?" How is this going to affect my anxiety AND motivation? It's about doing what's best for you.