I want to get pregnant (age 42) but after a hormon therapy my endometrium is only 6mm on the 23-rd day, what else can bee done to increase endometrm?

Decrease androgens: I like for my patients to have a minimum of 7 mm endometrium thickness around ovulation, with a lining that is too thin 1 can add estrogen therapy or dexamethasone. Also certain meds or even a subclinical endometritis can be associated with thin endometrium. Unfortunately one would more information about your cycle meds etc to really answer your question.