Sorry to see you haven't gotten in helpful insight. I can't help but respond to suggest an EF of 30% should be survivable unless it is just a point on an every decreasing EF. What has your doctor told you about the EF causes and expected future performance?
I am one who believes moderate drinking of alcohol would have negligible affect on the EF. Here I use moderate to be one, maybe two classes of wine or equivalent a day. Still alcohol may have bad effects on other aspects of your life, such as medications you're taking.
My EF is fine, I suffer from atrial fibrillation. I usually have a 12 oz beer with my evening meal. I sometimes substitute a glass of wine, or if it is a social environment I may have both over a two hour period. I have never associated any positive or negative affects from such moderate drinking.
In my case I used to consume a couple of drinks a day prior to the onset of AWMI in 2007. Since then, I haven't touched alcohol or smoke as part of a firm decision. Now I feel myself having a stance on moderate consumption of alcohol in an effort to maintain social interaction patterns. Will there be any danger if I opt to do that?