Did you still drink beer when doing IF? I think it may be worth trying IF again then without he beer consumption. Beer contains carbs and will thus increase your insulin levels and the alcohol will delay processing of carbs in your liver thus delaying the onset of fasting.

Also vegetarian diets are often carb-heavy and a major health benefit of fasting is the absence of carbs.

I am more of a multi day fasting person tbh. Fasting for two days and three nights surely is successful with me.