At a crossroads

I tried on the Picovoli top I have been knitting and don't know what to do with it. I just got through decreasing for the waist shaping and don't know whether to just rip it all back and redo it on smaller needles, or work with what I have and just add a few more inches and finish off. From trying it on, I do know I don't need to do the increases the pattern calls for.