Is it okay to keep getting Botox? I'm curious about the interval between injections.

After getting Botox once, I found the results to be more natural than I expected, so I am considering getting it regularly. However, people around me have told me that getting it repeatedly can lead to resistance or that the muscles might shrink too much, making it look strange, so I suddenly got worried. I received the injections on my face, and at first, I felt the effects gradually wearing off after a few months. When I looked into getting it again, I found that it is usually recommended to get it every 3 to 6 months. I am wondering if it is better to wait until the effects have completely worn off before getting it again, or if it is okay to get it done early while there is still some left. I also want to know if the muscles continue to shrink if I keep getting it in the same area, and if there is a point where they stop shrinking significantly. I don't want to drastically change my face shape; I just want to maintain the natural look I had the first time, so I want to avoid getting it too frequently. I also heard that the products and dosages used vary by clinic, so I am curious if switching products affects the effectiveness or duration of the results. If there are any people who have been getting Botox consistently in the same area for several years, I would love to hear how the effects have changed from when I first got it a few times to now. I am also curious whether it is advisable to intentionally take breaks in between, and what I need to pay attention to prevent developing a tolerance. I would appreciate honest reviews from those with experience!