I agree with you that the market is risky. However, it could stay high for a long time. From my book Profit from 2017 Market Crash, I recommend to act fast when technical tells us to exit - currently technical is fine but not fundamentals.
Here is my market timing result for today's market.
forget one important metric. Obama has increased our national debt to
recent record high. To illustrate, I can make the company look rosy with
all metrics (P/E for example) by borrowing a lot of money. It is
short-term gain but long-term loss as our children who do not have a
voice now have to pay for it.