Thank you for your response, I’ve followed a lot of those steps and have been able to solve some of my issues. Mostly thanks to Anti-Malware plugin which identified some of my infected website files.
However, I see this code in my website source:
<span style="position: absolute; left: -3938px; top: -2552px">
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</span>
I have no idea how to remove it, is there a way to find out what WordPress file is putting this code on my website?