the only way to think outside the box in music is to actually step outside the box. if you are accustomed to making, say trap beats, then that is the style you will continue making. The main reason people tend to have this habit is either they only listen to trap music, or only admire producers who make trap beats, and try to emulate what they believe is hot.
Step outside your comfort zone and start listening to all different kinds of music from pop and country to symphony's.
Once you find a different style to inspire you, try and make that kind of music. It may sound different, or not as good, but that is most likely because it's new and foreign to you. Don't trust your instincts and stick with these other styles. Let others hear the music.
A good way to find out if someone truly likes your beats is to take rapper acapellas, put them over your beats, and burn them to a CD. When you play it for someone don't let them know that those are your beats, and just ask what they think of the music. You tend to get a more organic response.