Based on the understanding and knowledge of following up with the cryptocurrency for the past 6 month, my inference is that the cryptocurrency is highlt volatile.
Is it a good approach to stay invested for long term in the altcoin space?
I think that's good just choose the right altcoin to hold with. If you stay in top 3 altcoin such as ethereum,litecoin or neo. This coins have lot of potential to the market, so holding this for long time I think it will bring good profit.