Promotion is necessary for every coin. Now it is very important to attract attention to the coin or project because competition on cryptocurrency market is very high and there are a lot of projects.
Even those who have done promotions are not necessarily successful even though they are known by many people because every project must have a good and real product so that it can be successful and also it will not be wasted time when making a promotion.
Agreed, but this is absolutely necessary if you want to publicize your coin and get people to know about it. The most important thing is to have a whitepaper and a roadmap so they can see what you want to do. Also, no matter how good your WP or roadmap is, without promotion, no one will know about your promising coin, so both are crucial and should be addressed but still it really depends on your project if it would be successful or not .