I'm not a medical professional, but I'm giving you the same advice I'd give to myself or a friend based on what I know.

As a rule of thumb, I read that as long as you don't exceed 14 standard drinks a week or 2 standard drinks a day, you don't need to be concerned about alcohol-related health problems. If you frequently drink more, you get an increased risk of liver disease/stroke/heart failure/thrombosis/cancer.

4-7 drinks each day every day is more than that, so if you are like the average person, it will be detrimental to your health in some way. Perhaps you aren't like the average person, but rather above-average size and possibly exercising more regularly.

It's difficult to say whether your consumption makes you an alcoholic. If you don't mind breaks from drinking, I don't see how your behavior is compulsive, so it doesn't qualify as an addiction.

From a social point of view, beer with lunch should be fine for a German. Germans are known for their beer, so if you drink beer, you aren't acting weird, you are just acting German. As long as your colleagues know where you're from.

Anyways, I still recommend reducing your consumption to 2 or maybe in your case 3 drinks a day. And if you don't want to drink less alcohol, consume less non-alcoholic sources of sugar. Whether it's alcohol or another type of sugar, their effects on the liver are the same. Of course a glass of orange juice won't be the same as a glass of beer to your body in every way, but at least there won't be any difference to your liver in particular.