I have also noticed that during these two last years, the altcoins are not getting much attention, some of them will never recover from their peaks. This next year we might see a shift in the altcoins behaviour
When you talk of a shift, do you mean a positive or negative one?
As far as i know, altcoins have always had the problems you talked about, a few of them pump and dump, and from there they do not rise again. Now that there are more altcoins with every passing moment, it becomes even more difficult to get lucky and find the ones that will generate you any profit, that's why a lot of people rightly say that investing in altcoins is similar to gambling.
Altcoins investment will only be right and profitable if you are investing in the right coins. But even so, it’s still hard to chose the right altcoins these days as every new project that is born in the market claims that they are legit and profitable, when in reality altcoins in general are not that profitable anymore these days.
That’s why it’s not surprising to see people shifting into bitcoin and invest into bitcoin at a maximum level. Although diversification is still the best option, but you can always invest in bitcoin and outside cryptocurrency like stocks and real estate, there are still high probability that you will end up successful.