One can always be trying to discover new ideas, because there are always new ideas to think up. There are an unlimited amount of ideas in The Universe. Ideas can be quite useful, it seems. There are always new problems to be solved and new concepts to be discovered. Thinking up ideas can be useful, enjoyable, entertaining, and even social.
Thinking up ideas is something that can be done alone or with others. It can be done in a business setting, or in a personal setting. This Universe will never run out of ideas that can be discovered. That seems like a good thing. Living never has to become boring, since there are always new fun things that can be thought up. There are always new and novel happy thoughts to happen upon.
In a billion years, it is a potential that even more new ideas will be discovered, and even then, there will still be an infinite number of new ideas that have never been thought of before. Everyone has the potential to discover new ideas. As soon as a child is able to think creatively and abstractly, they have the potential to discover and think up new ideas. The oldest human alive who is still able to think clearly and fluidly is also just as able or more able to think up new ideas, as well.
There are unsolved problems which could use new ideas to potentially solve them. Monotheism was at one point a new idea on this Earth. That slavery is wrong was at one time a new ideas as well it seems. Perhaps in the future, society will be quite different because of new ideas that have yet to permeate society.
Hopefully, some of the more useful ideas will be discovered and thought of sooner rather than later. It seems that having more educated humans on this Earth whose basic needs are met and who are allowed to freely express ideas should hasten the discovery of new useful ideas. And again, even in a thousand years there will still be new useful ideas that will have the potential to be thought of and discovered.