I hear this around a lot. So I thought I would offer a simple observation which leads to many ideas.
Censorship is running rampant on the internet. Ideas are being censored. Example: Bret Weinstein had proposed a new election structure, he formed a twitter account to spread the idea. It was then shut down by twitter. But its not just this, information everywhere is being controled. In comment sections, on social networks, websites are being shut down, links not allowed to be shared.
The internet was built as a technology to aggregate all that humans minds produce. Through censorship the internet fails to serve its purpose and becomes more a brainwashing machine.
Any activity which moves the internet closer to its intended goal will be successful. So if you are looking for ideas, think of Anti-censorship technology. Anything which can increase the flow of information on the internet.