Personally, I always stick to this mantra - "high risk, high reward." I've also been in that position where I hold so many altcoins (I still do) and they all lose value during bear markets. The worst ones are those whose team abandon the project altogether. Personally, I have made more money from altcoins than BTC or ETH. But I still believe that both BTC and ETH are more stable for long term investments. However, I still hold some altcoins who, despite their value is low now, the team is still working and some already have their products like Denet for example.