The president has little power to address climate change/wealth inequality on his own. That all relates to the budget and is firmly in control of congress. Replace Manchin/Sinema with two progressive senators and you would have the BBB bill, which would have addressed both these concerns.
With respect to encroaching racism I am just not sure what any politician can do about it. Ideally, you would like to change the mind of hardcore Republicans, but it’s not like they are listening.
Manchin/Sinema could not have stopped Democrats from using the reconciliation bill as a bargaining chip to pass the BBB. It was not called for by Pelosi, Biden or any establishment Democrat for one simple reason: They didn't care and expected voters to just show up anyway.
What are you talking about? They needed 50 votes in the Senate for a reconciliation vote which they did not have, because of the aforementioned senators. The bill was passed by the house (of which Pelosi was Speaker at the time). There was a lot of negotiation between the White House and the two senators to get the bill to 50 in the Senate. None of what you are saying is correct!
I'm relatively unconvinced by laying all the blame on them. The president is the leader of his party and has the massive power of the bully pulpit to help bring them into line. He was unable or unwilling to do that.