There’s a large literature devoted to this topic. So at the risk of being overly simplistic, let’s refer to the previous question and turn it around. That is, certain risks such as age, gender, genetic makeup, family history, and so forth cannot be changed. They are static. On the other hand, active psychosis, mania, depression, hopelessness, panic attacks, and alcohol and substance abuse are all things that can be targeted and treated with social interventions, therapies, medications, etc. They are dynamic and can change. So too can social stresses, such as legal problems, marital conflict, a school bully, or a sadistic boss be addressed. Access to lethal means can also be limited, although probably not eliminated.
If we think about risk in terms of an equation, there are many things you can do to decrease the overall risk of suicide. Many people with bipolar disorder will have active suicide-prevention plans that might include friends and family they can be with around the clock, having someone else monitor their medication, or ensuring that they don’t have access to a vehicle in the midst of a mood episode.