In my opinion, some of Bloom's biggest mistakes that led to his firing are:
a. The poor return for Mookie Betts.
b. Not resigning Kyle Schwarber. The dude has 52 homers this year so far. He is a good teammate, patient hitter and he would have signed for a reasonable amount.
c. Not resigning Eovaldi and Wacha.
d. Holding on to aging veterans at the last two trade deadlines when he could have got some decent prospects for a lot of them.
e. Not adding anything at the last two trade deadlines. If you don't sell, you have to buy right?
f. The last two teams have been poorly constructed.
g. Signing Kluber
Granted, Bloom did make some good moves during his tenure but the team just looked uninterested and undermanned the last two years. The fans aren't excited about the team. Attendance is down. Something had to change.