Its a good idea though. But it would have been better if you divide the total funds in a ratio of say 8:2 so that you can save about 80% in stable coins while keeping de remaining 20% in a volatile coin, probably BTC so that your funds can appreciate small by the time you are withdrawing your funds
I would advice you to put it into bitcoin because of its foreseeable longterm profit but sincerely speaking the investment window of 6months which you gave is quite short. 6-8 months ago and bitcoin was trading under $4k. The market is too volatile to say the price of btc in the next 6months. You might have to wait a bit longer for gains
Stable coins don't bring anything. And I am not sure what's more trustworthy - banks or some more or less known institutions that issued stable coins.
An idea was to
invest for growing the value. Investment means risk. And investments need time and 6 months may not do, especially in crypto, which is prone to big fluctuations.
But if he does so, then I would advise more than Bitcoin only, some amounts can go into something else. Maybe some small amounts into altcoins, maybe some amounts into gold or stocks... diversifying uses to increase the chances for a good outcome.
However, OP should keep in mind that exchanging his money into something else and back means fees to be paid.
So there's no good solution imho.