If you are a developer, don’t build another developer tool please. If you decide to build a developer tool, ask yourself when was last time you paid for a devel

If you are a developer, don’t build another developer tool please. If you decide to build a developer tool, ask yourself when was last time you paid for a developer tool, what made you pay for it, did you switch to a free version later? Without knowing your background, it is difficult to suggest any specific idea. You mentioned hosting costs and 3 months build time, so I assume you want to build a hosted solution that can be built in 3 months most probably a MVP. I will suggest you build a blog. For first 2 months read books on how to discover and develop innovative ideas, customer discovery, identifying customer needs, user flow and stories, everything a good product manager does before a product specification is written. For first two months, Write blog posts summarizing what you learnt from each book, and implementation worksheets/mindmaps that can be used to execute what you learnt in that book. By the 3rd month, you might have good idea how you may want to build something and a bunch of mindmaps and worksheets to use for any idea that comes to your mind. In third month, go to Show HN tab or product hunt, take the first idea that you find attractive and apply your worksheets and mindmaps to that idea. Contact the original poster and offer to collaborate and if you think you can do better alone, go for it.