Endometrial thickness depends upon menopausal status. If premenopausal, this is within normal limits. If postmenopausal, this is thickened and biopsy is warranted.
Myometrial heterogeneity is nonspecific, possibly representing normal variation versus adenomyosis. If your gynecologist wants to rule out the latter, consider MRI pelvis.
Cervical nabothian cysts are incidental findings; these can be ignored.