I constantly shut the "keep living, keep trying" voice in my head by remembering the reasons I have to ctb. All these years of being depressed, the fact my happy moments in life haven't lasted for more than a year while the bad times have lasted much longer, all the pain my ex caused me, her telling me of her future plans, her kissing with that asshole mere days after breaking up with me, all the hurt I'm carrying with me, all the disappointment, the idea that it won't improve because it didn't improve in these past 9 years.
That last one may be the most powerful persuasion tool I got: it didn't improve enough in 9 years, you're already fucking tired, do you want 9 years more of the same?