The origin of blow = suck, be bad/unpleasant recently came up in comments to this ell question. I'd always assumed it was a standard slang meaning reversal from suck. But a few minutes on google

I want to use it in the context of being bad at something. To be precise, i want to translate to suck less at a job every day to formal I'd have thought the transition from the original grandma idiom was pretty transparent. To the extent that go suck an egg! has currency (minimal, imho), it doesn't so much mean physically go away.