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
Expecting for a big rewards needs to take bigger risk, and holding for a 6 months is still not guaranteed to make money on that. OP have a better plan on this, but the market can't tell if he will earn or not, or anyone here can be sure about this one and yes the volatility is one of bigger risk. If you invest it on smaller coins then expect to take money longer, OP should think more before to proceed with his plan and consider all the pros and cons or else his money will be wasted and his dream house might be delay because he lose money.