1. Hold the bitcoin you have.
2. do not easily believe in news that will want to drop bitcoin.
3. telling everyone about the bright future of bitcoin.
maybe this won't be too influential, but at least it helps bitcoin.
I support your first two points but about the third point I am not so sure, believe me I have tried to convince people about bitcoin and how it's going to change the world and yet people do not want to listen, I have come to the point in which I'm tired of doing it and that is why I gave up, people are going to adopt bitcoin when they are ready regardless of what you do to try to influence them.
People do not invest their money in bitcoin and want the price to grow more and more. How is it possible? The price will rise when the investment capital increases, but if there is no demand from the people all over the world, the price will never grow rather it will go down. Demand affect the price, therefore people should invest in bitcoin for their bright future.