I do trust God. The question is how to know if something is an equal or greater good?
As I mentioned, you possibly cannot know for certain what is a greater or equal good.
Only God knows that. God can bring surprising good even from the smallest good and prayerful acts, as St John f the Cross and St Therese mention in the quotes given.
If one wishes to make promises to God, one’s guide can be to faithfully live the commandments, to love God above all and others as self [Matthew 22: 35-40]
the beatitudes, e.g. as represented in [Matthew 5:1-12]
[Matthew 25: 31-40]. And to avoid temptation, resist temptation
A private person’s lived-out promise to God can be their promise to be faithful in avoiding occasions of sin, and in obeying the Gospel and all that the Holy Spirit within the Church desires of us.
To what degree do private persons need to make vows about resisting temptation and evil,
and by living in practical kindness to others and in thankfulness and love to God,
because we already promise to do so, for instance, in Baptism and Confirmation and at Easter? Therefore we are already bound by these promises.