I saw the 2008 drop coming well in advanced, sold most of my stocks, but I didn't see the bottom or how fast the market would recover. I'm not the richest person on earth. Knowing the right time to sell is only half of the equation.
This story may seem off topic, but i think it is useful context for a discussion on Tesla investment strategy:
As someone who was both selling and buying a home in 2006/2007, holy moly that whole process was *replete* with red flags. Anyone purchasing a home in that era was told loud and clear that that it was all a house of cards teetering on the verge of collapse. It's hard to hear what you don't want to hear, though, especially when you have a financial stake in not hearing it, either because of your job, or your investment, or your dream of owning a home, for example.
I won't name every indicator here, but the process of buying the home and securing the loan were both shady as hell. And this was for a brand new home built by a large, reputable manufacturer. Not some lone slimy realtor or flipper. The process of being allowed the privilege of buying one of their million-dollar homes required you to attend a lottery in-person. My wife and I gathered there for the drawing (that we still suspect was rigged) and in the process of making conversation with the other prospective buyers, learned that, without exaggeration, 85% of the applicants were never going to live in the home, they were merely purchasing to sit on this brand new home for a month or two and then flip it for profit. What happens if the market simply levels off? 85% of the perceived demand dries up over night.
Then there was the securing of the loan. Contingent on being allowed to purchase from this builder, you were forced to use their mortgage company (i can't believe that's legal!). This mortgage company encouraged me to lie about my income, showed no interest in verifying my employment beyond a quick phone call to my boss verifying that i worked there, and worked their asses off pushing balloon mortgages and other exotic rip-off lending products on us. I had to threaten to scuttle the whole deal and really turn my mean face on to get them to offer me a fixed rate mortgage without penalties for early payoff (again how is that legal?), and even then it was not a remotely competitive rate. (I didn't care, because by that point i was just going to refinance the minute the papers were signed).
Anyway, the whole process was clearly broken and unhealthy. I can't say I made any shrewd investment choices with that knowledge, but since we were just buying the home to live in, the eminent crash and eventual recovery neither helped nor hurt us financially, luckily. I feel for the thousands and thousands who did get royally screwed over, though.
Anyway, I offer this as examples of the kind of things to look out for when a bubble is about to pop. Personally, i'm not seeing this kind of shady dealing with Tesla stock currently. I think their future is insanely bright long-term. I think the company is a model of sustainable business, and its problems are the best kind: external and short-term.
As for other stocks, and life in general ... well, my advice is to keep your ears open for things you don't want to hear.