I think mass adoption will happen by itself without any crypto projects that need to work together. Every project in the crypto will promote their project to the public so people will see and know that there is a crypto project that can be their investment in the long term. If one or more project can get their success, people will see that crypto can give the opportunity for them to make money. They will see that crypto is a new type of investment on the internet, which can be their way of making money besides the other investment type.
Today there are a lot of countries accepting the use of cryptocurrency and many people would like to make improvements and innovation on it. Some of them have some requests like the atm cryptocurrency to make faster transactions of withdrawal and also it has a low transaction fee. One of the things we can do too is to make investment and introduce to other people what does the cryptocurrency can do to make more earning in just a single day. Also, we can make a lot of projects that are related to the world of crypto like having seminars and sharing with other people. It is better if we encourage them to make savings at an early age so they can be independent person because they have enough funds to sustain their lives.
Yes the mass adoption of cryptocurrency will happen by itself or it will happen naturally for the nature of each crypto projects are to advertise themselves and for us who already have seen the opportunities that crypto can give it is our duty to extend those things to other people who still don't know about it so i agree with the seminars thing, in my school we have experienced this seminar about the blockchain technology and it is a great way to introduce crypto and blockchain to someone.