Help! My starter is more than 4 weeks weeks old, and is nice and thick with a good aroma, but is not getting bubbly throughout. It has a bunch of small bubbles on the top surface, but none visible through the sides of the clear mason jar. I had a starter 2 years ago that was clearly bubbly throughout. I'd hate to start over entirely. Any recommendations to get my sad starter to a healthy state? Appreciate any advice. Thank you!

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