If OP is using an HDTV, I recommend going a step further and buying either the Oneme N64 To HDMI converter, the Laboen N64 To HDMI converter, or the Hyperkin HDTV cable... All three are relatively cheap.
If you want even better quality, go for the EON Super 64 adapter, which is the one I have and works great. Or you can go all-out and mod your console with an UltraHDMI mod.
https://www.amazon.com/Nintendo64-Converter-Cable-Restore-Screen/dp/B07VB8HD8X/
You mean like this kind of thing?