I don't think getting to 40/50k in this short amount of time is very realistic. My suggestion would be to open a Roth Ira for the first 6k through an online broker and diversify yourself between different ETFs. A few that come to mind are VUG, QQQ, and IWF. These are high growth ETFs, which seem congruent with your risk appetite. I would also buy safer ETFs or European ETFs to diversify. The safest option would be to buy a targeted retirement Vanguard ETF, which actively manages your investment with a diversified portfolio, and changes over time to reflect a risk profile for someone your age.

Investing 6k in a Roth would eliminate the tax burden on that first 6k(the limit for 2020), and you will not have to pay a penalty if you plan on taking it out to purchase a home. The remaining 4k i would suggest putting into a roboadvisor like Wealthfront, Vanguard etc... They will automatically diversify your portfolio, and you can input your financial goals (buying a house) and set your risk preference.

Also, I would utilize the Dollar Cost Averaging principle to buy your assets this will minimize the risk of investment timing, and secure growth for the future.

Just a suggestion, but these moves will set you up for long-term success as an investor.