Personally, I have chosen 10 cryptocurrencies for long-term investment that fall into the top 50 of the coinmarket. Everything else I consider to be digital junk.
point is there as the chance of those asset outside top 50 depends with how the community will support them, unlike assets who already gained enough support from both traders and all those investors, with continuous developing and with adoptions that will take place the chance is high to provide decent profits.
The latest data from coinmarketcap is that there are 11,950 registered coins available on the market, the number of coins and tokens will make the competition very tight so that many coins only last a month in the market, this is the importance of the community immediately making regulations that regulate the creation of new projects so that they are not used as scams.
Whatever you do, scammers will find ways. Remember that they are also moving inside. They understand and they know when and how to. Adjust, the best thing is always to put your guard high and not to allow those scammers to beef with your money.
Make it a habit to start with good research before jumping to anything. Crypto projects offer a lot of sweet promises you need to sort what's real and what are those for alluring investors.