HYSA account closing. Where should I invest USD 1.5m cash?

Hey all, HYSA account with ~USD 1.5m has to be closed, any recommendations on where I should invest those funds in?

Probably looking at putting them into index funds, likely a US one, a global one, and also my local home country's.

Any good undervalued stocks?

Guessing I can also put them under IBKR cash ~2.75% for now?