Definately don't give up. I'm no expert on rivers, kinda new myself. I think you have probably over-complicated it. With your new kit and knowlege do you still fish the same way you did with the lesser set up?
Obviously not, so revert back to your initial simple tactics and improve on them later when you can see a reason to do so.
You had a system that worked for you, perhaps not as often as you would like-but it worked! Re-wind.
We all read, watch videos, some buy the best kit, all make mental plans. But it all goes out of the window when on the first cast you (me

) end up with the fly in the nearest tree, bush, reed, ear, grass, hedge, dog, or disappeared completely.
That's rivers, simplicity is the key. You are only trying to catch a wild fish and they are fiesty enough, always looking for a barny.
Go back to your roots maan.