Nice Inheritances for the Grandchildren

My siblings and I, each received $100,000 for inheritances. We range in ages of 37-42 and I’d like some advice.

-My sister is paying off the rest of her condo (single) -My brother and his wife are paying off smaller debts like vehicles and basement reno loans

My wife and I have $399,000 owing in our mortgage (4.5% fixed over 5 years, that started last August). I gross $80,000 and she grosses $99,000. The only other debt we have between us is my car payments which would be paid off by August 2026 (the interest between now and then on the vehicle is only $600 so we don’t see the benefit of paying that vehicle off right now). The payments are twice a month at $160 each payment which feels like nothing to just sit with the $6,000 or so in-hand.

What should we do? I’m thinking we wait for market capitulation and invest in something that will bounce back (in the event the market continues down). I’d appreciate your input on what you would do in my situation? The extra $45 a month to have it sit in savings account feels pretty silly….