TTC for 2 years

Okay, so bear with me here, I've never posted something on here before. I got off of the depo shot 2 years ago because my fiancé and I wanted to start trying. I know it takes a while for your cycle to regulate, so I was patient during the first year. I went from irregular, to having two periods a month, and finally back to normal with ovulation symptoms and all. We have been trying every month for the past two years with absolutely no luck. I don't if my timing is off or if something is wrong with me/him. I've been really upset the past month, especially with all of my close friends now pregnant. I've seemed to lose all hope in TTC 😔 I guess I'm reaching out for advice or support. Has anyone else tried for this long? If so, what did you do differently that finally worked?