Here, from years ago, is an assignment for you:
Put your 50mm f/1.8 lens on your camera and, using just available light, go shoot twelve things in your living room that show its character. Or shoot lots, but pick the best twelve.
Then put these together in a 3×4 arrangement, like this (yes that was my living room at the time):
This assignment forces you to look properly. What is it that shows the character? What makes for a simple shot? It also forces you to use the right techniques for simplifying and filling the frame. And you get to practice low-light shooting, selective focus, and so on.
But most of all, you get to think about subjects. Initially you’ll struggle to find ten – then suddenly 100 pictures will suggest themselves.
Show me your results!