Struggling with IUI failure

I had one round of IUI and was so blessed that it worked and I now have a gorgeous 18 month old. We starting trying for another baby through IUI a few months ago, and as much as I tried to prepare myself for failure, I’ve really struggled when it’s not worked because it worked first time before. We’ve done two rounds and no luck. I never thought I’d have to do IVF but now it feels like that’s my only option. I feel like my clinic gives everyone the same protocol and doesn’t take individual medical circumstances into account, but we can’t afford (logistically) to go anywhere else. I’m 39 and desperately want another child. When my husband says we’re blessed to have our child, I know that’s true, but it doesn’t change the yearning for another. No real point to this post other than to get my feelings out. It’s such an isolating process, no one knows we’re doing it.