If he can't appreciate how serious I am to improve myself and to improve the marriage, there's nothing more I could do.
You aren't making these improvements and changes for him, but for you. Remember that. Because if you are doing all this to try to win him back and it doesn't work, then you'll be left with a sh*tload of resentment.
There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.