Inspiration is everywhere, it’s all around you. For me it’s not hard to find. Personally I don’t rely on inspiration, it just makes me feel better, its not life-altering. Inspiration leaves me inspired for about a minute then its back to reality. If there is something I want to do, I do it. The fuel to my fire is already inside me. Outside inspirations (books, theories, quotes, music, films, people, nature, etc.) can sometimes add freshness to that fire but the original intent is already there. I think you need to really focus on what it is exactly your looking for, I don’t think it’s just inspiration. You say you’ve been searching for a while, maybe you should change the direction you’re looking in. The world has a lot to offer us so it can be hard to choose sometimes. Make a decision. If that seems too much, make a decision to be curious about everything until you find that one thing you’re looking for so you won’t have to look no more.
Advice is not my forte but I hope this helps.