Great job. 3 days is great for a first fast ever.
The key thing this is going to do for you is in the coming weeks, you will feel like you have more control over appetite and eating. Then when you feel ready, try another 2-3 day fast.
The way the fast helps you is not the calories you don’t eat during the fast itself, but rather the control it gives you in the subsequent days and weeks, and the rebalancing of hormones and insulin sensitivity.
3 days is still really good for the first time!My first fast ever was also 3 days. Probably 13 or so years ago. Focus on rehydration but also find something to do. Even without the hunger, the boredom can still get you.