What variety are your tomatoes? Some very early ones are determinants. They make, then they’re done. If they’re determinants I’m not sure anything other than rooting cuttings will fix it. Curious to see if anyone has any other advice.
Maybe it’s hot where you are? Mine have just now started making. With temps above 95 for several weeks it was a task just keeping them alive.
And it did. But now it seems shot, and we still have 80 days until the first expected frost!