Is there a way I can fix these horizontal lines on my GBA SP screen?

For a while now, I had the issue that with the lightest of movements, the power would go out. According to Youtube tutorials it was an "easy" fix my soldering the metal plate there off, cleaning what was underneath it, and soldering it on again.

The good part: it doesn't turn off anymore when shaking

The bad part: the screen does this now whenever I turn it on. Everything seems to be working according to the sound effects I hear when pressing buttons (aka trying to "play" a game to test it out) but I'm at a loss what I could do to repair my beloved childhood gameboy.

If it's impossible it's impossible, but I was curious if anyone knew IF I could fix this, and if so how would I tackle it? Thanks for reading thus far!