I need some opinion if panic selling can contribute of rapidly drop of the bitcoin price. If it is right how can we convince to the bitcoiners to not doing panic selling.
Unfortunately, you cannot convince all people to invest and then wait as per your suggestion. Different people come with different expectations and they also have different patience levels.
The most to the point answer right here, if one can convince one in trading world to do what that person wants then it's actually called a market manipulation, but the reality is that different people have different thinking. This is what making cryptocurrency market really unique and kinda affected purely by demand of the community not by authority or anyone else.