Two the most important spheres where devs should take more effort are project development itself and advertisements..
I also think that the project developers should increase the aggressive advertising of their project. Competitors do not sleep. To compete you need a very good marketing strategy.
I believe that Advertising and Marketing are priorities in the development of projects. Especially for young and little-known projects. People learn about the coin and start using it. But if the coin itself doesn't advertise that it is necessary to nobody except its creators...
Airdrops and bounty campaigns are good way to advertise project. I think that most of investors learn about project right from them