Once I came up with an idea, I launched it and it makes very good money (50-70k euro monthly). It looks very interesting for others, having a nice business, being an entrepreneur, but for me it's getting too boring. I'm not passionate about what my startup does. I really want give up.
Should I kill my startup and build something that I'm passionate about or will love doing it? Or does every business get boring by the time? What are your experiences/advices?
Figure out what you want to do, slow down your involvement with your current venture as you scale up what you are passionate about doing.
I think most people here would recommend that you do not shut down your current revenue stream until you have at least offset it with a new revenue. View your current situation as an vehicle to help you do some awesome things in your next venture.