I would create “smart home” things for disabled people.

I had enough time then, to go, ask them and find out what is really helpful - without the need to make a profit.

For example, one has asked me why there isn’t a washing machine for a wheelchair’s wheels. A real problem. The wheels get dirty when he is outside, and then he enters the home and they are still dirty. The machine would have to work without him leaving the chair and it needs to be installed inside the home - not in a garage or so.