Things, either good or bad; happen to us because of our luck. We have little or no control over our luck, so we may have to accept our fate.
Things also happen to us because of our decisions (either a decision or a stack of decisions over time). This is where we have better chances of winning.
So, the outcomes that manifest in our lives are the mere results of our decisions. Therefore, all we must do is make sensible decisions. These decisions are all choices we make over time. The choices include developing good habits, being in a good company, doing the right thing, continuous learning, and many more.
It is much easier for me to write than to make wise decisions consistently. But finding ways to make the right decisions is perhaps the best self help I can offer myself!