Trying to time the market is always a bad idea
Stock market on average over long term always returns 7-10%. You'll beat 80% of the so called experts in a long term low fee index fund (eg vanguard)...Yes We are due for a correction soon but not worth it to try to time it. Keep saving money in tax deferred accounts and buy more stock for retirement
Don't worry about low interest debt. You're better off investing the money and earning the 7-10% on average or investing in your own business.
I bought my house with a cash offer but turned around and financed 30 year fixed since rates are so low. As the other poster said - using debt as a tool is not a bad thing. There is some idiot on letsrun who poses as a CFA (Dave Ramsey or something). He'll tell you to always have zero debt but Guy is a moron. It's clear from the advice he gives that He isn't a CFA and he should probably be reported to the CFA institute in Charlottesville VA. Maybe Rojo and Wejo can help us do this