Short cycles, 19 days apart

[Sabina]

Hi,
I am 41 years old and try to live healthy: ample sleep, exercise, healthy diet etc.
I have a few children, the youngest is 3 years old. All spontaneous pregnancies.
For the past year and a half I've been having short cycles, ranging between 19 to 24 days. I also have a very early fertile window starting sometimes on day 3 of the period. (I always tended to short cycling, but not like this!) Additionally I have a high FSH: 30 on day 3.
What can I do to get back into balanced period cycles and possibly get pregnant again?
Do you recommend taking myo inositol for this?
Thank you very much!!