Go to preferences->animation-f-curve->sorry don’t remember the name of the top of my head. I think it’s unselected opacity or curve alpha. Something like that. Adjust that to make it brighter. You can also change curve colors thru the n-panel(technically called sidebar). Just select the channel on the left and then set the color on the right to custom. I like to mess with people and change it to rainbow. It may be called random now.
