Facebook pixel - improve event coverage for initiate checkout

I have a swimwear brand and I am running a lot of meta ads at the moment. I see that my event coverage for initiate checkout on my pixel is only 54% and the recommended coverage is 75% for better reporting accuracy and performance.

It's my high season now so really want this to be working as effectively as possible. See screenshot attached. Apparently i need to do event deduplication. I do not understand this however, I would like to work with someone who has experience with this and can improve my coverage rate for me so my pixel is working a lot more efficiently.