Traditional Investment Ideas to Secure My BTO Fund in 3 Years

I don't like the volatility of coins. While I know it is all the rage, I’m staying away from it for now and focusing on more traditional investments.

Looking to Grow My Savings for BTO in 3 Years: Safe, Low-Maintenance but reasonably high rewards Investment Ideas? looking at about $20k to start with and maybe make enough to cover furniture and reno.

I am thinking of those investment brokerage firms so that i can try make a bit more. Possible. ?