Short luteal phase

Abby

Hello all, so I have a short luteal phase I only make it to 10dpo when my cycle starts. I am on progesterone 200mg to start 2 days after I get a positive opk. Still it isn’t thickening. Any tips or tricks to help thicken it? Blood work all came back normal. I also take letrozole. I feel so let down that I don’t want to continue trying cause my body isn’t working correctly. Any advice would be greatly appreciated.