It's simple buy bitcoin. Hold bitcoin. Someday in the future, profit. Too many people load their portfolio up with complete crap coins trying to chase profit. It works for very little people. Most end up with useless bags when bear markets set in.
There is a simple method like you say but most people don't like simple things in life but like to make them complicated. Therefore they will go with shitcoins more than bitcoin while again having a lack of faith in shitcoins.
Just like that, crap gets filled in their bags and they can't sell it properly. Then they are stuck unable to sell and find themselves in a loss position.
Keeping a bitcoin rich portfolio should be aimed by all