How often do you schedule your square jaw Botox injections?

Lately, my jaw joint feels stiff when I wake up, and every time I look in the mirror, I'm really bothered by how my masseter muscles have bulged, making my face look square. I was really satisfied when I got Botox once before because it slimmed down my body lines.

I am thinking about getting Botox to refine my jawline again. However, I am a bit worried about developing resistance, so I am debating between domestic and imported types like Xeomin. Also, since getting it too frequently might not be good for me, it is difficult to schedule.

I am curious how often people who maintain their square jawline with Botox get their injections. Do you get it right away when the effects start to wear off, or is it better to take a break for a while? I would appreciate advice from those with experience.