When I started, my goal was to make the hoppiest IPA I could, because I like them. After three years, my focus has shifted to traditional lagers, and making them right. Yes, I do love a properly done IPA, but I like better a nice refreshing lager that seems to satisfy something in me.
As homebrewers, as we gain experience, we will focus on what we like to drink; for the most part, that is why we brew. I have never understood (and have often disparaged) the silly (to me) trends that beer brewing, whether commercial or home, have drifted towards. Gose? Gross. Sours? Why? If I want sour I'll go get some Sour Patch Kids candy. When I drink beer I want to taste what makes it BEER; malt, hops, and whatever magic the yeast will add. As someone who grew up in the 70s and 80s, I remember what commercial "pilsners" used to taste like before they started adding more adjuncts to cheapen the process and stretch their brewing dollar. When we lived in Utah my dad drank "Burgie" beer; of course, back then it was the usual 3.3% ABV that was allowed by Utah's restrictive laws, but I remember it was quite flavorful.
As to the original question; horizons only narrow if you let them. There are so many styles out there, and recipes to follow or tweak to your own taste, that the possibilities are endless. Especially for all-grain brewers; we can make whatever we want, and hang the majority who say we can't, because it's not "to style" or within BJCP standards. Brew what you want to drink, I say.