my portfolio has about this distribution ...: 80% hold for a long time and 20% for a short period. I think this is the correct distribution of the deposit
If I choose to hold a BTC or ETH, I will choose the long term, and if I hold the other coin, I will choose short term, because the short term will give us low profits, but long term will bring higher income
Back than, when the market was normal and the prices of many coins were growing at a slow pace, it entirely depended on the type of coins that were easily available. Coins for example BTC, ETH and LTC were preferred for long term investment. Altcoin other than the mentioned were favored for short term investment.
Right now, when the market is down, invest in any coin that can give you future benefits when the market will rise. Do not expect instant profit now and give it some great good time to grow.