With the recent changes in BTC price, altcoin is getting weaker against BTC, so, this is a good time to pick and fill the bag. Another important part is, after BTC bullrun, once BTC get stable, altcoin follow the bullish trend.
Is it right decision to pick some more altcoin?
Im not sure, i dont trust altcoins that much and besides, BTC will not be stable in price, it will always be volatile and will surprise you everyday. Anyway, bitcoin price has gone higher already lately but we dont see any sign that alts are following. It will still be your decision but be wise, pick the ones that have already built good reputations for a lower risk.