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
If you are willing to take some risk but if you are just questioning the stability of stable coin it's also hard to predict if whatever stable coins you'll
use will still remain with your given time span. Saving into crypto is a good option if you will enhance your knowledge towards this industry. Knowing
the coin to use for your saving is very important, and if you plan also to invest some of your funds buying bitcoin coming from portions of your money will be the best thing to do.