It is very painful to see someone else making progress with your idea. However, this should not make you quit on entrepreneurship. There are several ways to salvage the situation.
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Be determined to take action
The most painful thing about seeing someone else acting on your idea is realizing that, if you had been proactive, you could have done so too. Probably you had a tight schedule and you decided to shelve the idea for a while, or you were not sure about your ability to so it well. In the process, someone else spotted the opportunity and grabbed it.
The first thing to do is to acknowledge that you could have done better, and being determined to do better next time round. While it's not possible to act on each single idea you have, you can make an effort to take even small steps to the really great ideas. Keep in mind that consistent small actions add up to great results.
Take a different angle
Even though someone acted on your idea, it is likely that they did not do it in the exact same way you would have. Consider different angles with which you could approach the same idea. This especially applies to information products, because each topic has so many facets. Be open-minded and think of unique perspectives and opposing views you can use to twist the idea and present it in a fresh way.
Make it bigger and better
Think about how to build on your original idea and enlarge it. Think about successful sequels to best-selling books. Think about modifications and improvements that could polish the idea and elevate it to new levels of success. Consider innovative marketing tactics that could have a significant impact on the popularity of your idea or product. Whatever you do, never limit yourself. Eliminate your doubts and keep aiming for higher goals.
The truth is that there are a limitless number of ideas in the air waiting to be tapped. If you open your mind, a few good ones are likely to fall in. Start keeping an idea journal where you can record good ideas as they come. Participate in brainstorming sessions frequently and see if you can hatch more ideas, or upgrade the ones you already have.
Create an elaborate plan for the first ideas you want to work on, so you won't feel confused or overwhelmed by how to proceed. A wise way of going about this is to think about the end-result you want to achieve, and then working backwards. What are the action steps necessary to achieve the outcome? List these steps and arrange them in a sensible order of progression. The result will be a detailed roadmap towards success.
Finally, begin taking action! If it means sparing only 15 minutes daily, you will feel more fruitful and make sure progress on your tasks. Take one step at a time, and within no time, you will be basking in the glory of your success, while someone else kicks themselves and says, "Hey, that was MY idea!"