I'm an idea guy by heart. Try to lose this notion. The key to success in a startup (apart from timing, luck, having the right idea, grit, focus, etc) is deter

I'm an idea guy by heart. Try to lose this notion. The key to success in a startup (apart from timing, luck, having the right idea, grit, focus, etc) is determination to see things through to completion. You have to believe in your idea and see it through to the end, where 'the end' is hopefully an exit of some sort probably years in the future. If you see yourself as "an idea guy" you will be distracted by the new shiny thing you think of, and if that happens when your startup is in a slump you'll give up before you see success. You do need to be "an idea guy" to build a startup, but all the ideas need to be about driving the core idea forwards. You need to see yourself less as "an idea guy" and more as "a <whatever the startup is about> guy". To that end, I'd recommend starting a side project to see if you can grow it without getting bored, giving up, etc.