Go to the coinmarketcap pages for all three of the coins in your portfolio, and look at the graphs over the past week or month. Yes, all three have gone up in terms of USD, but all three have gone down in terms of BTC. BTC has outperformed all of your coins, and if you had only bought bitcoin, your portfolio would have a higher USD value than it has now.

Altcoins follow bitcoin. If bitcoin goes up then altcoins go up, but as you can see, they usually don't go up by as much as bitcoin does. You not only need to add bitcoin, but you need to make it the largest proportion out of all the coins you are holding.