most of which I have met, the thing that many people do so that their altcoins are popular is to improve services, and really realize what is on the roadmap. besides that they also showed solidity from their team.
The things that they make their altcoins popular is by advertising and improve their project, so that people would be interested to invest in their project and gain more popularity. It is also the reason why bitcoin and other top cryptocurrencies have huge prices because they have improve and by the advertisement they see in social media like youtube, facebook, twitter, and etc. Right now, I am also looking for a great trading platform who could easily convert my fiats into bitcoin and vice versa, then i started to found
Darb finance where it is an good exchange and a wallet at the same time that i highly recommend you to use this for trading.