How can I invest $50k in my savings?

I would recommend robo advisors (I am using Stashaway and Syfe).

Positives

• No emotion involved. Their tech generate some asset allocation, you choose what is suitable for you and deposit some money. As you are risk averse, they provide portfolio for risk averse people too (more bonds).
• Fractional shares (you cant buy 0.5 shares)
• Way cheaper than short term endowment plans, but not as cheap as buying shares on your own.

Negatives

• They provide explanations what happens to your money if the robo advisor companies shut down, I am not sure whether you are comfortable with that.
• Some says it promotes laziness (you should still do due diligence since it is your money).

Alternatively, you may subscribe to regular savings plan to SG big banks (I believe this eliminate the first negative), it fulfils requirement for higher interest rate for the savings account.