bitcoin will definitely hit its highest price again I think it will be in the current year but for sure I don't know if it will hit ATH or not, at least I'm feeling good when bitcoin is over $50k, shadows at that price will start in new market atmosphere and more investors believe in bitcoin again.
The altcoin explosion is hard to predict but the best moment is indeed in 2021 if this happens again then I think people who hold a lot of altcoins will feel a lot of joy because they have achieved what they want.
If we look back, we thought 2017 was the last bull market that we will see but we are wrong because few years later the bull came back to us. I believe the same thing can happen again after some year. It's normal to feel good when you see that prices are recovering but you shouldn't limit your happiness with that alone. Much better if you also practice how to stay calm and be positive when the price is not feeling well.
If all people will just think that way, the price won't stay the same for a long time because people will keep on buying and ignoring the fact that the price could go down more. Alts explosion is not hard to predict but you can use btc as a guide.