I think it would help if you give us more details.
When did your libido diminish? During the intake of progest-e, before or after?
What was the purpose of your progest-e intake?
What was your hormonal situation before the intake? Did you have blood work done?
How exactly is your libido now? If you feel comfortable answering, it would be helpful to know how often per day you feel the urge to have sex/masturbate and if you experience morning wood. The latter in combination with sexual urges in the morning has anecdotically proven to be a good objective evaluation for overall libido. Possibly because it is strongly influenced by the circadian rhythm of steroid production.