I'm level 20 now, have tried everything I can't seem to catch ANYTHING, even bought "major luck elixir", to no avail. Please don't answer with basics: I know to wait till bubble submerges, have tried all kinds of "timing" when that happens, etc. etc.
1) Choose a fish to catch. Fish swimming in the center of the body of water are easier to catch.
2) Throw the lure immediately in front of the fish. A lure thrown relatively farther from the fish, but still in front of it, generally causes the fish to divert its path.
3) Wait for the lure to glow; then, when the lure distinctively and suddenly plops underwater where it is no longer perspicuous, hit the space bar.