Here is partial answer to your question - "what is pushing up the market"?
https://realinvestmentadvice.com/retirement-savers-are-piling-into-stocks-is-that-a-good-idea/The FOMO/permabull Brigade are sucking up the strong US economy narrative, and whilst unemployment remains ubder 5% that will reinforce their perception.
Commitment of Traders Report shows hedgies are the biggest participants in the futures market, they'd see what is coming and want the indexes as high as possible for their LT shorts to springboard from . Probably easier for hedgies to analyse/control the process as undoubtedly they have people on their team who were players in the market in 2000, 2008, 2019, etc.
I notice DiMartino-Both, Snider, Van Metre, Schiff etc, are all putting out videos at a fast clip now, (daily in some instances), Thiss enviroment must be giving them plenty of concern, and thus plenty to talk about. Snider did say in a recent video this was a very slow grind to a recession this time.
Looking at NDX, see anything similar in weekly volume patterns? Two of the maddest buying perioids of the last decade - and both ahead of a cliff. The sheer size of the M7 might make it run longer this time, but dont be behind the wheel at the last moment like Thelma or Louise. Dry powder for your sho(r)tgun has never ben more critical.
Layoffs and the BTFP ending early March are the next gotcha moment to wait for.
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