Some patient do indeed have multiple eyelid folds that can become variable depending upon eyelid swelling etc. Most patients have a single eyelid crease/fold, but not all. I would try to avoid anything that causes your eyelids to swell (salty foods etc.). Surgery to improve an eyelid fold can deepen, reset it but when there are multiple folds it can be hard to get rid of all of them because they crease the skin much like paper and its hard to completely remove them. I would not suggest surgery at this time.
Correctly performed double fold surgery is what you need.
A properly structured double fold will force the subsidiary crease to tuck under the fold when the eye is open. This requires an anchor blepharoplasty double fold procedure. This is how these situations are "fixed." You need a very experienced double fold surgeon to perform this work. There is no substitute for a personal consultation and assessment.