When the work isn’t a good fit, or the client relationship seems awkward, or they won’t agree to do an impact assessment, or they’re more interested in price than value. These are all warning signs. You’ll regret it if you say yes.
Taking on the wrong jobs is often driven by neediness – for extra money, or stimulating activity when we’re slack. The extra money isn’t worth it. The lost opportunity and time can never be regained. Examine your motive for involving yourself in the wrong stuff.
You want to make a difference? Only do work you love, with people you like.