Comment by rqtwteye

Make sure you talk to all potential users of the library and work on understanding what their issues are. Take them seriously.

Don't become a bottleneck. If you don't deliver what's needed, teams often are forced to do their own thing in order to meet deadlines.

Run it like an open source project. Allow others to contribute. Make it easy for them to do so.

Don't lose interest after the first release. Keep up the momentum.