What do you think of Koinly to do my crypto taxes? Any experience with it? https://koinly.io/
I have not used it, but they have an active reddit community. They should have better information about it there.Why not hold them forever? Too risky? I'm a bit hesitant also, because what if it goes up to a million in 10 years? 
You can hold them forever, it realistically will be higher in 20 years than it will be in 5, and I will always hold a percentage of bitcoin. What is your motive for selling? Diversification is very good, but you do not have to 100% liquidate to get into another sector.
- Jay -