Treatment to unblock tubes consists of surgery, either open or laparoscopically done. But success of surgery depends on the site & type of block. Also at her age of 36 years, IVF will give better chance of pregnancy
although it is little costly. We have to understand that success rate of IVF in one cycle is not 100%. You can continue with another IVF cycle if affordable, OR otherwise can go for surgery to unblock tube if it is openable. (After consulting doctor who is having expertise in the procedure)
Wish you Good Health.