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?
Hard to tell if it is the right decision , I can only tell you what I see in the market. In the past days some alts started to getting high returns. It could be because of the relative stability of the BTC price as you already speculated.