Ideas for coder

You should probably work on something you like and develop it into a service or a product. Have fun with it!

Running a business is fundamentally different from working in a job. In a job situation you can work on something you don't like and you will still get a paycheck; even if you're not very good at it. In some jobs you can potentially under-preform for years before you get fired.

When it's your own business, you may have to put in 12 hours of hard work 24/7 for months and if you're under-preforming, you will never make a penny.

To keep doing this, you have to work on stuff that you're interested in. Something that helps you grow as a programmer. Find a challenge! In business, you have to grow. That means you must constantly challenge your self.

It's not for everybody.

BTW: If your mind can imagine any function that a software can possible perform, most likely that software already exists. Coming up with something totally new and 100% original is an immense improbability.

The best way to start is to identify a problem right here on warrior forum then provide a solution and sell it. I usually start with the problem and then build SaaS for the solution. Doing it this way you know you going to make sales from the start, provided you have a high quality product.

You have 10 years experience, do what you did for this years, I'm sure you have great projects that you can do even better than last time

Team up with someone who needs a developer.
Then you can learn "business' on the fly, while you make a living.

Make sure you vet the hell out of any potential partners...
everyone talks a good game, most have really bad follow through.

- Good luck

10 years is too much experience, you can try the field of games, even if participants make money online I think you can code tool for make money onliner according to their own requirements.

You could try freelancing at freelancing sites such as upwork and look at competition for good ideas.