I don't think you need to increase the duration or frequency of your fasts just because you're naturally inclined to eat less often. You're probably reaping the benefits of IF already. Keep doing what you're doing.
As for longer fasts, I did 8 days once with nothing but positive effects. If you feel inclined to try, I would say go for it, but absolutely make sure that you are in a safe, supportive, restful and nonstressful environment. I did my 8 days while I was living alone and working at a low-stress job. Then 2 years later I felt like I wanted to try again, but I was living at home then with a mother and brother who were skeptical at best and always trying to get me to eat something, and going to a job where I had to run around a lot. I lasted only 3 days.
Oh, and weight loss will likely slow down and stop for periods of time. That just seems to be the way it goes on the PB.
You lousy kids! Get off my savannah!