advice on using my money to earn more money. (bills, bonds, treasuries, cds, dividends, VOO?)

If someone had $100k just sitting in a bank account, how would you advise them to let that money work for them considering they have very limited knowledge of investing?
-get a financial planner or advisor of some sort?
-use the money to purchase dividends instead of sitting in the bank account?
– or would you use it for the bills treasuries and such for the easy 4-6%?

Or invest in real estate? The money was originally going to be used to buy property at auction, but it's ended up just sitting. Auctions have been terrible since the pandemic.