do not sell your bitcoin / ethereum

Treat cryptocurrency as you would treat any other form of high-risk investments (i.e. precious metals and stocks can be comparable to cryptocurrencies as they're also examples of high-risk investments).

If you're okay with some losses, then you could transfer a high-risk investment over to a low-risk investment (in other words selling the bitcoins and then pushing the profits into a savings account with interest). This is a long-term investment decision but after the initial losses you shouldn't really face nearly as many losses as you would keeping those bitcoins in your wallet.

If you're trying to get as little loss as possible then you can gamble on the market; just keep an eye out on how many people are buying and selling which is information that could suggest a potential incline/decline in bitcoin value.

Also holidays that incur mass spending are another thing to consider, this is where scripting can come in handy since it's not feasible to keep an eye out on every transaction (too many to keep track of to be honest) so you could get a better gauge for the current bitcoin market by filtering out transactions that are larger than $10,000 or any value you want to filter (this has less stress on your network and can still produce useful information based on how often someone's trading bitcoin in amounts that meets a specific real-world value).