look at ebay for gear sales.
this miner that I am selling does not work for retail miners
https://www.ebay.com/itm/156984520065if this sells it will not sell to a retail person as power is not cheap enough.
When gear like this sky rockets in price and sells out real fast we will then have retail fomo.
Still a good option for someone who rents a flat at a fixed price with electricity bills included

But I don't think today's retail investors would even consider mining. It got too competitive years ago, so there's hardly any discussion about individual mining in the bitcoin sphere.
I believe someone, long time ago, pointed out in another thread that a good indicator of retail hitting the peak (and therefore a good indication of an exit point) was the popularity of crypto trading apps (mostly Coinbase) in App Store. Quoting from memory, I think they Coinbase app was the most popular one during the 2017 and 2021 cycles peaks. I'm not sure was it for all apps or for financial category only.
This might not work in this cycle as Coinbase is not as popular as it was + other non-crypto financial apps also added crypto investing features.
Edit: I just realised adaseb essentially said the same above, I mised his post when typing this.