Ride your bike more - you really need to put at least an hour a day hard riding, or even 2 hours a day, is much better because in reality you won't be able to ride every day. Are you using a HRM? Good inexpensive investment to understand when your body is working as it should. Riding 40 miles a week just isn't enough. Riding by time and HR is one of the simpler methods.
Also ditch all alcohol for some specific period, say 6 months or a year and see how that goes. My reasoning for a specific length of time is that is an attainable, close-ended goal so you are more likely to achieve it as a test run.
There, I just gave you the advice I should be following. I took up commuting to boost the miles, and really need to drop the single-drink-before-bed.
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Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.