One should never leave crypto on an exchange long term. If you're using Coinbase, you can avoid fees using this trick:
Get a hardware wallet to hold crypto long term.
Andreas Antonopoulos has important advice about holding crypto:
One of these cryptos is going to become the next Google of finance. I'm an IT person and studied Andreas Antonopoulos's book Mastering Bitcoin. The government would have to shut down the internet to eliminate bitcoin. If they do that, then they will have much bigger problems such as the survival of the government itself.