I would suggest that you look into hardware wallets.
Basically, you get your code and you hold it on a device—it’s not connected to the internet.
It is not a “hot wallet”; it has to be stone-cold—and you have to have physical access to it.
Of course, this makes the most sense if you're holding a high-end and high-value crypto like Bitcoin or Ethereum.
But if you have a large portfolio, and everything adds up to a few thousand dollars or hundreds of thousands of dollars, it would make a lot of sense to get into hardware wallets.
Now, it’s really important to keep in mind that when you invest in a hardware wallet, the chances of you successfully fighting the temptation to buy and sell your crypto portfolio on a daily or frequent basis goes down tremendously.
This could be a good thing for some people, and for others, this could be a problem, so just keep that in mind.