For "improving," possible synonyms could be enhancing, upgrading, strengthening.
"Third-party source" might be external platform, outside host, independent provider. " possible synonyms could be enhancing
But the user's instruction is to rework each word with three alternatives. Hmm, that might be tricky for words like "the" or "a." Maybe the user means replace each significant word, not every single word. Alternatively, they might be asking for a paraphrase where each key term is substituted with three possible synonyms. not every single word. Alternatively