I love the idea of reworking (salvaging) an overworked art journal page to transform it into something altogether new. Here's an idea from Dina Wakley on resurrecting an overworked page. Draw a pattern on it that serves as a mask and then paint over the entire rest of the page.
Cover the background with white (acrylic) paint.
Then top with a second color (without waiting for the white to dry). Add a third color on the outer edges of the page the create shadow and depth.
The lines inevitably get blurred in the painting (above). Add another layer to deepen the lines. Use a white Gelli Roll pen to add journaling (or doodling).