Survival Analysis Question (For Attrition Prediction)

Used a Cox PH Fitter for an initial run at a survival analysis at work. Got a concordance index of .75. I know what this metric means, mechanically. But I'm wondering how this value compares to any tests you've done in your job. I'm a junior analyst and just trying to come up with a model that is as accurate as possible. Any tips or requests for further info are certainly welcome!


Also, variables I'm currently using are:

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