Advice please! IUI or IVF??

K

We have been trying almost 4 years. Just seen a Specialist in July. All blood work great. Semen analysis great. Had a polyp removed from my uterus. This is my second month on Letrozole. I’m thinking I need to go further with treatment but I’m stuck on if I should try <a href="https://glowing.com/glow-fertility-program">IUI</a> it go straight to <a href="https://glowing.com/glow-fertility-program">IVF</a>. Anyone have similar situation? What did you do or wish you would have done?