I will add a demo system where users can run a node and play. This will be purely for educational purposes so those who for any reason cannot run a node will be able to learn how it works without having to download the entire chain. This will bring bitcoin closer to home and show people that it is not too complicated or at least all of it is not.
The goal will be to encourage more users to take the step and run their own nodes, contributing to how decentralized the network is.

That is what I will do on the side, as the main course, I will create a fully decentralized system that is as immune to regulation as bitcoin is. This will replace other services that are being dominated by centralization like exchanges and mixers. This makes it much easier to stay private and not have to choose between decentralization and efficient service.

I know this is not adding anything to Bitcoin directly, but that is because there is mighty little one can add, all we are left with is to create efficient, censorship resistant channels and we are not doing so well now.