[opinion-is-bad]

If you don’t control the fusarium from time to time, the tomato plants will look great but give no yield. One of the other commenters mentions a new technique for winter cover crop to avoid rotation. I’m not really sure how much of a risk fusarium is for a home garden, it might be as much as our farm or perhaps minimal.

Nitrogen is necessary for proteins so you can get larger yields, but if some other nutrient is missing then nitrogen alone won’t help. K and P also need to be present in good quantities, as well as a mixture of iirc 17 elemental trace elements. I’d use a well-rounded fertilizer like 7-7-7, and if it wasn’t growing then assume there was a disease or pest at play.