WordPress issues :(

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So having multiple issues but I all think they pertain to one thing. The first one is I can’t access my media library just loads forever the next one has to do with wpbakey and when I edit any section it just has the circle animation loading forever ( also if I try to edit the classic way and click update it gives me an http error 500) and the last issue is when I create or edit any sliders and slider Revolution plug-in it gives me an Ajax error. I’ve tried deactivating plugins one by one my PHP is updated as well as the memory to 512mb. Any suggestions? Currently on the most updated WordPress version

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