The amount of joy you experience is limited to the amount of knowledge you have.
In Eden, there were two trees: the tree of life, which granted eternal life to all who ate it as long as they ate it, and the tree of knowledge, which dispensed a greater understanding of reality to those who ate it as often as they ate it. Adam and Eve did not have joy until after they gained knowledge by eating of the tree of knowledge.
Adam and Eve lived in a paradise before the fall, but they didn’t comprehend their situation. They had to acquire experience to comprehend what they had in Eden:
And now, behold, if Adam had not transgressed he would not have fallen...they would have remained in a state of innocence, having no joy, for they knew no misery; doing no good, for they knew no sin. (2 Nephi 2:22-23)
Without experiencing negatives, we can’t even notice—let alone enjoy—the equal and opposite positives.
Joy requires knowledge. Without knowledge, you can never notice— let alone enjoy—the good things you have. Without knowledge, you likewise can’t comprehend the negative experiences. Without comprehending negative experiences, you can’t overcome them.
The first step in increasing joy is to obtain more knowledge. Getting more knowledge means gaining a greater understanding of reality, and is discussed extensively in the author’s book, The Glory of God is Intelligence.
A vast array of circumstances can generate more knowledge. For example: generating new questions, discovering limits of existing ideas, finding new problems, etc.