If you want your $40,000 savings to grow, do not store it in a STABLEcoin. It does not grow in value. You may do so in other coins. I highly recommend that you do it with the top 10 coins, Bitcoin preferably. If altcoins, Ethereum, XRP, or Litecoin will do.
Here is a big warning. If your plan is to save them in crypto for 6 months, there is no guarantee that it will grow. There is even a risk that it will not, and worse fall in value. If that happens, you will be forced to extend that 6 months until you have made gains.