Perhaps, instead of doing the exercises in the book as-is, you can use the grammar that you learned and make your own sentences in something like the Japanese Sentence a Day Challenge thread. Or any other thread that focusses on Japanese output.
Some people write longer paragraphs and chat with each other a bit, and others post one or two sentences, sometimes related to whatever grammar study they’re focussing on at the time. It’s a way you can put your Japanese into practice, as is the goal of the Genki exercises, while not necessarily doing something that boring. People may also end up giving some feedback if they see something that’s not quite right.
Hope you’ll end up finding a more fun way to practice output. ^^