I don't really get bored with my cooking, but sometimes I have a hard time of thinking of something I'm in the mood for. Often, however, something triggers a craving, like seeing that yesterday was National Chili Day, or seeing something that someone here made, and I just have to make it!
Back when I first got into cooking, in the early 70s, it took a while to build up a good number of spices and other seasonings (not readily available then, and long before the internet), and I'd see a recipe, with something I didn't have, so I'd have to find it! In the 80s, I started going up to NYC occasionally, and you could find anything there, if you knew where to go! Philly didn't have much back then, though that has changed, and now, even the suburbs in my area have just about anything. Plus, the internet, of course.
My first cuisine obsession was Chinese, and I got just about every essential ingredient for it. Later, the Thai, and other SE Asian cooking. And most recently, Indian cooking, mostly that from the southern regions, but some from others, as well. Eventually, I got just about every ingredient I would see in any of the recipes I would see.
Another thing that I had to do sometimes, when I could not find an ingredient anywhere, was to grow it! And this is another thing that helps keep my food interesting, and sometimes things I'm looking forward to, especially in the summer, when I'm waiting for that first ripe tomato! And I'm always trying new things there, and inside, as well. So there's always something to keep me interested in food!