There is no doubt that Bitcoin is the favorite crypto currency of all people and it is the desire of every person, that he has Bitcoin in his wallet. Bitcoin has its own importance but because of Bitcoin you can't ignore other altcoin.There are many good and strong projects in the market right now which have given huge returns to people in the past, and for the upcoming bull season too, there are projects that can be expected to yield huge returns.
I also agree with you that our capital is more secure in Bitcoin, but Altcoins in the market also have the chance of huge profits. So in my opinion, along with investing in Bitcoin, you should invest in good and strong coins in the market.
There is risk in small coins but a small amount of risk should be taken for high returns, but if you have chosen good coins, you can minimize your risk.