How to get roto brush back

I'm very new to After Effects. I've been following a tutorial in using the Roto Brush to blur a TV screen in a video. After selecting the areas I wanted with the roto brush, I ran a gaussian blur effect.
The tutorial had me create a duplicate layer and delete the roto brush effect from that duplicate.
When I previewed what I had done, the effect wasn't blurred enough in parts, so I figured I had to go  back and refine the roto brush selection.
So I used Edit>History to step back to before just before I created the duplicate layer, but after I created the roto brush selections.
Except now I don't see the areas I selected with the roto brush tool outlined as they were, even when I've selected the roto brush tool.
Am I missing something? Can I get my roto brush selections back, or do I have to do it all over again?

It happened again, and this time, clicking the Toggle Alpha Boundary button isn't helping.
I remained stepped back before I created the duplicate layer and I adjusted my roto brush selections in the entire clip.
The tutorial I'm following said to duplicate the layer, which I did, then delete the roto brush instance from the bottom layer.
Then it said to apply the effect I want (Gaussian blur in my case) to the top layer. I set it at 65 which worked great yesterday. But today, nothing blurred.
So I tried to find my roto brush selection, but I can't get it to turn on again, even though I am on the correct layer, in the layer panel (not the composition panel), with the roto brush selected. And using the Toggle Alpha boundary button does nothing.

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