Interjecting again, the only way I'd recommend 'getting bigger' is by means of mechanical stress, i.e., strength training. I NEVER recommend bulking-and-cutting as it's typically a great way to get fat. And also because I don't believe it's necessary to gain muscle.
Take the fat off by reducing calories. Strength train HARD to grow muscle, if indeed, after your years of training, you have any more muscle in you to gain.
HOWEVER, again, typically men *look* bigger when they've leaned out, even if the muscles have not grown, and even if the muscles have become slightly smaller.
Incidentally, there are studies that show that muscle will grow, on starvation level diets, given sufficient stimulus. This is why I'm skeptical of the notion that you need a 'calorie surplus' to gain muscle. My own son reduced calories and added slabs of muscle.