Some things that can help the coin are:

- Running a node

- Mining

- Explaining the benefits of BIP (no ICO, no premine, no instamine) to other crypto enthusiasts on Reddit, Twitter, Facebook etc.

But if the current developer has indeed given up on the coin then the number one issue would be finding a new dev (or preferably more than one). Those of us who cannot code can help by spreading the word about BIP and donating to a development pool (if new devs are found).