Good to know that you seem fairly healthy.
Since no issue could be diagnosed, our specialist had advised us to try conceiving naturally at first. So we did that for about a year. However, we had no luck!
This is when we visited another specialist.
There are a couple of fertility treatments out there. IUI, IVF and ICSI are the most common ones. Surrogacy is also an option. But all these treatments are best discussed with your specialist. They will be in a better position to advice and give you suggestions.
The course of treatment, cost, and the time taken will all depend on your medical condition. When you visit a specialist for the first time, be prepared to talk about your entire history. This will help them gauge your situation better and suggest accordingly.
Hope I was able to give you a rough idea. However, imo, the fertility specialists would be the best people who could advise you.
All the best!