I'm in my 40s and I'm curious about the Botox injection cycle and how to get them without looking unnatural on my facial expressions, especially for frown lines and fine lines around the eyes.

Hello. Now that I'm past my mid-forties, there's something that bothers me every time I look in the mirror, so I'm writing a post like this for the first time.
What used to only be visible when I smiled now has faint vertical lines between my eyebrows even when I'm not making any expression. Lately, I've developed a habit of unconsciously frowning while reading or looking at my phone, and it upsets me because every time I do, the furrows between my eyebrows seem to be getting deeper due to the tension. Fine lines around my eyes also spread out like a fan when I smile.
So I'm thinking about getting a consultation for Botox on my forehead or between my eyebrows. My biggest concern is that after the procedure, my eyebrows might look heavy, my eyes might droop, or my facial expressions might look awkward, making me look fierce. I've heard a few times from acquaintances that they ended up with "Samurai eyebrows," so I'm getting scared. I'm wondering if it's possible to soften only the wrinkles while keeping my facial expressions natural, and if that depends on the doctor carefully designing the procedure based on my facial muscles.
I really want to make sure that you administer the correct dosage using genuine products. I heard that if they reduce the amount or dilute it just because it's cheaper, it won't be effective and you'll need a stronger dose next time. It would be very helpful if those who have actually received it could share their experiences, such as how often you usually get them and whether it's better to start with a shorter interval.
Lastly, I would appreciate your advice on which would be better for a first procedure in my 40s: domestic Botox or the imported Xeomin, which is said to have less resistance. Since it is my first time, I don't want to be too ambitious and would like to go for the most natural look possible. Thank you for reading this long post. Please take care not to catch a cold during the changing seasons!