A verse can be related to others, in a ratio between 0 and many.
This opens the doors to another good memorization technique: creating your own story with a set of verses. In this way, a group of verses can be retained in your mind.
A good exercise is to relate parts of the Old Testament to other parts of the New Testament. For example:
So, you can memorize a bunch of 3 verses in the same story!
This type of exercise also helps to better understand the whole of the Bible.