OP, you want to know about situation of crypto market in a few years and where to invest, what is the best coin.
Actually that is the million dollar question and every one of us would like to know the answer to that question
No one can give you an absolutely correct answer to this question, and it is actually part of your responsibility to analyze the market in detail before making any investment and find the best investment option for yourself.
I advise you not to rely too much on the advice of others, because everyone has a different situation and experience, and different investment plans.
There is enough information on the internet so I suggest that you first learn to do market analysis and based on that and your personal goals and financial capabilities make an investment decision, and it is also important to have a clear exit strategy.