Should I cut back on my tomato plant to produce more tomotoes? It has grown all over the small garden.
Yes. Cut off the growing tips.
I did a little sort of experiment a few years ago -- pruned and pinched tomatoes on one row and left the others go except for really weak suckers, which I removed. I got far more tomatoes from the plants that were allowed to go wild, and the fruit was not appreciably smaller than the pruned tomatoes and there were many, many more of them.
My tomatoes get tied to a rebar stake in an effort to keep them somewhat in check, but other than that they receive minimal pruning. I get tomatoes by the wheelbarrow full. That is the story for my area because I have a growing season of 8 months or so. In a shorter season, you may want to concentrate on a few less slightly larger fruit.