I am reading about Ordinals, Taproot and about 400k blocks waiting in the que in mempool.
Sorry but where to check there are 400k blocks waiting in mempool queue?
400k is probably a typo from the OP. I didn't go into this number, but it's actually more in the vicinity of 400 (not 400k), and even then it's a gross overestimation.
you can find them here:
https://jochen-hoenicke.de/queue/#BTC,24h,weight