Can anyone recommend books on how to build tolerance? I work a customer service role with some very difficult clients and is a role that requires a ton of patience

I find myself frustrated by;

1. Repeating and tailoring instructions on how to solve a problem with a demographic that has limited technical skills

2. Repeating myself between clients who have similar questions. I often resolve the same technical problem multiple times per day.

I would consider myself a decently patient person but this job is starting to wear me out like a broken record and I could really use a recommendation on how to reframe my frustration or build tolerance/patience so that I can feel better at work.