"Prosperity" seems to have become a dirty word in some Christian circles, in large part due to extremes among what I consider to be false prosperity teachers, as opposed to biblical prosperity teachers. Some believers have become so offended by those who have misrepresented the Bible's teaching on this subject that they don't understand what true prosperity is.
A big part of biblical prosperity is walking into your destiny and being able to do what God calls you to do when you’re called to do it. It has nothing to do with driving a Cadillac, though it could very well involve having a reliable, long-lasting vehicle with which to do the Lord's work. It may not mean living in a mansion, but it could mean having an inviting, spacious home in which to minister His hospitality, host neighborhood Bible studies, or take in people in need.
True prosperity is about being free to live out God's calling on our lives and being a conduit of His blessings to others.
"The Lord delights in the prosperity of His servant" (Psalm 35:27)