Been doing this 3 years, and honestly, email still works for me, but only with the right list and targeting. You gotta keep the list fresh and segment well, otherwise CTR will stay sus. Changing subject lines alone won't cut it long term imo.
just my 2 cents, I ran similar tests last year with US lead gen and the payout variance was nuts. I had offers on MaxBounty that paid out 30 and on Perform[cb] the same offer netted me 25 after fees. Real payout on the ground is often way lower than what the networks push, especially once you...
Been doing this 3 years and yeah, approval can feel like luck sometimes even with legit traffic and decent sites. imo, just gotta keep trying and not get discouraged when they ghost