Verify wrote on 08/03/22 at 17:50:55:
As a lifetime 1...e5 player, I can only admit that I have the same problem. When I grew up, the Ruy Lopez was still called the "Spanish Torture" but at least many systems have been considered playable against it. Today, I have the feeling that most of those systems are in bad theoretical shape (Tschigorin, Breyer, Karpov, Smyslow) and you really have to study the absurdly sharp lines of the Marshall or Open Spanish with their huge body of theory. One of the reasons why I am considering to give up 1...e5.
I don't know the status of the Zaitsev system. It might be worth considering.
Of course, there is the Berlin, but I assume that you've already considered and rejected that variation.
There are several other lines that you might want to consider.
Jonathan Tait recommends the Schliemann, 3...f5, in his book.
Dangerous Weapons - Ruy Lopez advances the Aronian variation, 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7. It has been played and analyzed by Victor Mikehalevski, here on ChessPublishing.
There are a few ...Bc5 lines. That's all I will say as I never obtained a firm grasp on those lines.
Dangerous Weapons - !e4 e5 looks at Bird's variation, 3...Nd4. It might be worth a go.