You already had some altcoin in your portfolio so I don't see any reason for you adding more altcoin. With the unencouraging market situation where it's highly unpredictable if bull run is still coming so soon or in the next four years, only Bitcoin can save here as some of this altcoin may be dead before the next bull run if not that soon. Presently most of this altcoins have dropped below their last ATH while Bitcoin is still above it's last ATH. So I will encourage you to add enough Bitcoin to your portfolio instead of adding more altcoin.