My Savings Plan Matured: What Should I Do Now?

My 3-year installment savings of 12 million won is coming in next week. Putting it straight back into another savings plan feels iffy because the rates are so-so, and after the trauma of cutting my losses on stocks last year, I can't easily get back into them.

For now, I've just parked it in a high-yield savings account, and I'm curious how people in similar situations handled it. I'm considering deposits, bonds, or dividend stocks.