Improvement requires letting go of what you already have. Obviously, the beliefs, relationships, circumstances, or goods you currently embrace bring you some level of joy. But it is dishonest to pretend that this means that they are final, perfect, or flawless.
There is no harm in seeking joy and happiness. That will always lead to something better. The harm comes when you assume that what you presently possess precludes the existence of something better.
Only those without wisdom are foolish enough to think that something imperfect or incorrect is final, perfect, or flawless: “Folly is joy to him that is destitute of wisdom: but a man of understanding walketh uprightly.” (Proverbs 15:21)