I'm pretty sure they did most if not all of those things. They probably didn't realize it was a problem that they had to get ahead of, in terms of the leaders. They might have tried do that and immediately hit the wall with the star players (can only say Nola for sure, but...)
Also during spring training the vaccine was not generally available, so the education campaign hadn't really started yet, nor was it possible for most players to get their first shot. Plus the 85% rule wasn't instituted until right after the season started.
They still botched it, in any case. The manager can't get the players to listen to him, and not enough players are able to hold their own teammates accountable. Imagine if the five best players on the roster routinely didn't run out balls, ignored red lights at the plate and third base (the latter of which happens a lot already!) or ignored a bunt instruction.
And yet this team seems to have some resilience and chemistry. United in ignorance.