I do think there are some scary indicators (Value/GDP, CAPE, MAPE, calls/puts) which indicate we're farther along than that, but yes this could take years to reach a top. The GME escapade and the massive rush of retail investors into risky assets with perfect indifference as to whether they are investing or speculating indicate to me we're reasonably close. I have also been ridiculed many times over the last year for expressing hesitation about current valuations of Bitcoin, TLSA, GME or ARB.

Perhaps you're right though, and this has a long way to run... I'm afraid I just can't bring myself to invest in things which are overvalued due to FOMO rather than actually making money or having a prospect of making money. Old-fashioned I know.

Re pulling out of NASDAQ, I'm not sure that's a good example. You never made it back implies you lost something. You might have had indifferent returns in other assets, but not a loss. If you invested in 1999 on the other hand, you made a loss till 2013, over 10 years later, after another bubble burst. To me it is more important to avoid risk of extreme loss than attempt to chase extreme gains.

The Shiller book on Irrational Exuberance is better than the Greenspan movie IMO ;)