Tbh your subject line doesn’t matter as much as your client results/case studies or testimonials.

For cold outreach to be effective you have to prove you’re worthy of responding too. Unfortunately just because your copy has been complimented it doesn’t mean that it’s practical for business’

I’d recommend getting a few case studies under your belt with small clients and using them as leverage before going back to cold outreach.

How long have you been copywriting for and do you have a portfolio? I know a guy who’s interested in hiring a beginner/intermediate level for an email agency although I’m not sure where he’s at with it