What accessories/attachments make a pistol only survivor viable?

This is just a hypothetical just like this whole subreddit is.

So for some reason you are stuck with only a pistol for life. No loopholes or exploits. This means no AR or similar "pistol" equivalents.

You can have whatever accessories your pistol choice accepts so those stocks that attach to the grips, red dots, plug n play style carbine kits, suppressors etc.

What accessories/attachments would you need for your pistol to hold up decently compared to a ar15?

Now I'll say this because I know it's coming anyways. We are not engaging anything past 50yds max. Even with a rifle people seem to want to engage. But if you are at that distance and undedetected or even detected but not in immediate trouble, your first option should be to disengage and walk/run away. Body armor, not everyone has it. Out of 100 people maybe 9-15 have body armor AND have decent plates. So we aren't worrying about that either.

What is your choice?