There is another truth that, IMHO, bears heavily here.
For a generic married couple, one partner changing themselves can change the entire dynamic of the marriage. For so many, the goal ends up being to change the partner.
But life is a bit like math:
Changing one part of an equation will generally result in a different outcome or result. The outcome of an equation is determined by all of the terms and operations within it. Altering any part, whether a number, variable, operator, or constant, will affect the final result.
As well described upthread, there are some circumstances that you’re facing that you may be able to change. There are also some circumstances that may be beyond your control. Generally, though, we have some ability to manage our reactions to these situations, these events.
And meditation, therapy, exercise, and any number of other modalities can often be helpful in changing how we respond to life’s challenges.
I hope that you find something that can help you in your current circumstances.