When I got into investing in the 90's, the rule was 65%. The market has gone through a couple of cycles since then and I've seen how newbies get killed not keeping their eye on the macro-economic environment. The thing about momentum markets is that they work great until they don't. It's a gambler's game around here in REI. The advice to buy and hold could be a decent proposal if you are married to REI and are happy with 8% total return.
My approach is like Warren Buffet's - stay away from the crowds when it comes to investing. This is a time when smart money is selling real estate, if they can find an attractive asset class to invest in with the cash. It's a lot harder with big money than small money to make that adjustment.
Be patient. A lot of "gurus" are peddling courses now that they can't buy at attractive prices. It's a pattern that repeats itself every cycle. Keep your eyes open, study the larger economy, and look at undervalued asset classes. If you forget the primary rules of investing (buy low/sell high & don't lose money) you are doomed to soon be parted with your capital.