Both bitcoin and altcoins are going to see increase during 2021, but don't get carried by the hype train, they will still fluctuate, but something almost certain is that they are going to become stronger while the fiat currencies are going to get weaker.
Which fiat currency will weaken? I don't know if you noticed this or not, but looking back on everything in 2020, the epidemic has adversely affected the global economy and many countries have had to put in place support packages to keep it going. The economy is right now and they're printing money for us to use. I'm not too pessimistic, but what's going on makes me and many people feel that fiat is no longer a safe haven when the global economy is volatile and there is confidence put on cryptocurency. I think next year we will see more changes in this market, I and many people are hoping that what we have chosen is correct.