Hi Cristina, i solved this by adding an automatic field that keeps the date when the status was changed, and then another automation to send an email 90 days after this. If you need any help don't hesitate to contact me and i'll be happy to help. 

Hi Travis, Can you explain how you made this? I'm trying to send an email every 3 months after a record's status changes, do you have any idea on how I could automate this?