I like this progress bar idea.

I suppose there could be zap goals for notes and/or zap goals for profiles. A progress bar would probably be easier to display on a profile page, but maybe there can be a special fundraiser kind of post that shows a zap progress bar like how the poll posts have their own format.

Or maybe if the user sets up a zap goals on a post the zap counter could show "21k / nk sats"