Hi Vutdoan I'd say the expression "way more" is informal, and expressions such as "much more" or "far more" would be more standard. I might suggest this re-wording: - I received far more appreciation from my mother than from anyone else I knew/have ever known. If you say "have ever known", that includes all of your acquaintances up till now.
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vutdoanI especially received way more appreciation from my mother than I had ever received from anyone else whom I had ever known.It makes sense what you wanted to say, but it sounds awkward in grammatical and structural way.