... until the bubble pops, which seems like it might be happening now. I just sold most of my shares.
but my favorite investment method is 're-balancing' between non-correlated asset classes. Set X percent of your money in equities and the rest in bond funds, for example, then if stock rises vs bonds, sell stock and buy bond funds until you are back to the same percentage.
The idea here is to force yourself to (slowly) sell into bull markets, and (slowly) buy into bear markets. I think that's the closest you can come to "buy low, sell high"
(I'm not in the USA).
Also had a lot in a single stock which was going a bit risky for me. (Although my greedy side said hold it, it could be worth a lot in the future). If I buy in again, maybe I will go for an Index or portfolio.