Both the long term and short term approach is good, depending on the currency you're dealing with. But I know short term holding or trading should be more lucrative, but also riskier. When considering holding for long term, it's best to hold bitcoin, stable coin or altcoin with huge market capitalisation. It's always great to ensure that you're actively following the news in the market to know when it's best to divest because the market is not predictable.