The book of Proverbs is good to read for someone desiring to be wise / righteous.
Eccl 5:5 Is there an advantage to vowing if one fulfills it over none at all?
The book of Ecclesiastes is another melancholy book. It might be easy for one to conclude that what they do doesn’t really matter since “all is vanity”. I think this is why we are admonished in the NT to store up treasures in heaven, since earthly treasures pass away. If our focus is on ourselves, our accomplishments, or our possessions, then we will likely be disappointed. Dying to self and serving our Creator and His will for our life is really the only goal worth pursuing.
Song of Songs, reads like a play. Why is it part of the Bible? Chap 5:7 The guards beat and wound the woman, taking her clothes. Then the play continues on like this wasn’t a big deal? The man (Solomon) goes missing multiple times in the text. Perhaps he is with another of his many wives.