Bitcoin is really a reliable currency, if our assets are all in bitcoin and there are no altcoins there is really nothing to worry about during bear season. But when it comes to making profits during the bull season, I think it would be a mistake to focus solely on bitcoin and ignore other opportunities. We should not deny that many altcoins will give better returns than bitcoin during the bull season, so I don't think we should just focus on bitcoin and ignore altcoins. But to determine the right time to invest in Altcoins is an extremely difficult thing, it depends on each person's knowledge and experience. We need to be very careful when choosing to invest in altcoins.
Altcoins are worthy too but it requires deep investigation that which altcoin can give your profit therefore people only choose bitcoin as everyone knows about it and everyone share knowledge about bitcoin more than altcoin as a consequence of which people are attracted more towards bitcoin than altcoins.
We cannot deny the success of altcoins but in market bitcoin success is increasing day by day and if there occurs bear season then people are afraid of bitcoin investment which is a suitable option so how they will trust on altcoin?
Bitcoin's price is not so high these days and altcoins price also decreases therefore preference of bitcoin will be more than any other altcoins as altcoin can goes down anytime.
If you don't have too much knowledge or are afraid of choosing the wrong altcoin, why not try ETH? I believe that the reputation and success of ETH is not inferior to BTC, even if looking at the growth rate in 2021, the profits that ETH brings are even higher than bitcoin.
Regarding investing, if you are shy and afraid of taking risks, don't expect to receive high profits. If you want to have what others don't have, you have to do things others can't do. That's the rule of life. Just because others are afraid they can't do it doesn't mean we will be like them.
But in my opinion, BTC and ETH are more than enough for our investment, there is no need to spend too much time on other atlcoins.