How to fix 403 FORBIDDEN ERROR on your WordPress Website Permanently

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I get the same error when opening an XML template with the Wp All Import plugin. Will this method solve my problem?

Hello brother getting this 403 forbidden error while working on the wp backend, It comes for 5secs and disappears, The same happens while working on the post editor JSON error and the post doesn't update or publish for a few seconds and again it works perfectly, I tried everything and even Host provider did everything to resolve this but no result, should I do the same method shown in this video? will it affect SEO? I have 2 news portals and happens to both websites hosted in the same account. Not sure if this is a hosting error or some WP error?