Hi, I'm sorry you got bad news. MFI can be a very hard Dx to accept and deal with.
We're also MFI (morph 4-5%, motility low, count 1-5 million/ml) and we were told by our RE that with these numbers we only have a good chance with IVF/ICSI. With ICSI they just choose the best sperm and inject it directly in the egg to help fertilization. We asked about IUI and were told that it would be a waste of money and mental energy. Nobody also said it was impossible but just very, very unlikely.
We did a fresh cycle in June that ended in an m/c and are just now in the 2ww of our 3rd and last FET from IVF#1.
I wish you all the best, regardless of what path you choose.