What to do with continuation pay

So I plan on taking the continuation pay bonus next year when I hit 7 years TIS based on my PEBD from my national guard time and current active duty O-2 and I pin O-3 in late December/January which is when I would start the process of applying for it.

Question is once I get that money what is the best place to put that money? I’m assuming after taxes it will probably be like 15k.

My goal with it would be to have it to use for when I get out once the adso for it is over in 2030 and buy a home in the greater austin area which is where my wife and I would like to stay. We currently own our home outside of FHTX which we bought in 2022 and I plan on staying here until I get out and then either sell it or rent it out. I would like to make the money grow a bit so I can use towards the future or any unforeseen home expenses but is a HYSA the best for flexibility? Or just dump it all in some kind of vanguard product? Or a combo of the two? I’m not too familiar with stocks and all. The only thing I do is put 15% of my base pay toward ROTH TSP and that’s it which I have been doing since I was a 2LT. Any advice would be appreciated thanks yall!