How can I make my shelf sturdier?

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I installed two wooden 49 1/4 shelves in my entrance closet but not sure what I can put under it in the middle to secure it if I need to put semi heavy things on them. I tried a shelf bracket but it was a bit flimsy and other ones come with an extension that gets in the way of storing things. Below you can see the piece I tried using.

q how can i make my shelf sturdier
q how can i make my shelf sturdier
q how can i make my shelf sturdier
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