You can probably use a Trezor ledger or create some cold storage wallets if you don´t plan to move your coins to often I suggest.
No, the question is not about safe wallet. I don't think it's a problem. As I see more likely just to lose the major part just by doing nothing.
The best way is to convert everything in USDT, it will always be equal to $1, or in coins not falling after bitcoin. But in the latter case, there is a risk that they will fall for other reasons. In both situations, it is important to have time to convert back, in time when the market turns around. Automatic saving, doesnt exist, as far as I know. You can buy equipment for mining, within a year it will not have time to depreciate much, plus you can mine a certain number of coins. Or to create master node. It will be long hold with garanteed profit.