I broke my HRV

Since mid-October my HRV has been going down every day. I don't know how to improve this.

My average sleep score is 30. On a daily basis I'm fine, I don't think I feel stressed or anything but these parameters seem to say otherwise.

Any advice or has anyone gone through anything like this?

https://preview.redd.it/aqg04tuw6zge1.png?width=1308&format=png&auto=webp&s=20bbd88b3fd39c6add4ae7451e613611acf7be01

P.D: Thank you all very much for your answers. I should find some time to relax and try to get back to normal levels of rest. I will have a medical check-up shortly.