Hmm okay, starting to see the problems, first improvement might be a single horizontal "precut" a few holes up from the bottom.The difference may be an American vs European, but this is a strip board with essentially all strips already in use. Every strip is pre connected to a pin of Xena. Over here that is quite unexpected. Perhaps if the Xena pins were connected to 2 or 3 pins, then an empty strip was left free for whatever.. Or even a "sea of holes" all unconnected for maximum flexibility without needing to cut the traces up.
Or even at 4 /5 hole intervals as is common for digital IC based strip boards.
I'm guessing then that the length is due to the number of required strips for all the lines connectable? IN which case mu cut it then comment was less helpful than intended