Help to thicken lining?? Any ideas

Jo
Hi all. I'm on clomid and do ovulate. Had a chemical but no other luck. I found out I have a thin lining and that is more than likely the reason the egg is not sticking. Has anyone any ideas on how to thicken my lining? If anyone has been in the same situation please comment I've been ttc for over 4 years so anything would be helpful