Slide up Text Effect

What's wrong with simply using text animators? You're making this way too complicated.

Mylenium

I think the expression you have should work. You just need to set up a paragraph text layer sized horizontally to give you line breaks at the appropriate place. Animate the text position to move up slowly, and the source text expression should take care of the rest.

I don't have time to write the expression right now, but I will tell you what it needs to do.

Currently, all the expression does is type a new word whenever it comes to a marker.

When you need a new line, the next Marker must have a carriage return before the text.

Then you need to write an interpolation expression that checks the time of the marker, subtracts a starting value for a move, then moves the text up every time a marker is found. This should give you the new word move-up action.

To get the whole line to move up when a new line starts, you might need to reference Anchor Point or Position to sourceRectAtTime(height).

I'll have to check my resources. I think I have an animation preset that I created that has most of the required code. My friend Dan Ebberts can probably write the expression without even opening AE.