If I had to express a blanket solution, in a single word, it would be to simplify. I think we probably have much more novelty than we need, to lead purposeful, fulfilled lives, in which we feel accomplished.
Nascaireacht wrote:
...scribble one on a scrap of paper!
I have found that this one helps, immensely. I don't know whether you're more tactile or visual, but I am mainly referring to the idea of journaling, because it helps me to pace myself. Some things are embarrassing to write, but there is relief in articulating them, so that they can be acknowledged.
Seclusion can be impractical, but earplugs have proven to be useful, as well as having ordered surroundings. Some of this might involve literally covering things, in my case, as this helps me to forget them.
I am much delayed in processing sensory and emotional information and am finding it valuable to remove myself from aggravating influences, some of whom are the sort of people who can debase the simplest of assumptions. Probably because they are so conflicted, they won't find a rut. Wherever they go, chaos follows.
The effect of separation is not immediate, but re-lived irritations do taper off, given enough time.
Self care can help. Some of these issues might seem to nag, unnamed, from the backburner, but the rhythm of habits lends to a feeling of order, which helps me to concentrate. Some people might call it the daily ritual, but you might do something, every week or month. I feel that it helps to serve as a sort of temporal milestone, by which I gauge my life.