Looking for advice on HSK 4 resources and a good teacher/course

Hi everyone! I’m currently preparing for HSK 4 and I really want to get a very high score, but at the same time, I want to genuinely improve my Chinese rather than just study for the exam.
I recently took the HSK 3 exam and got 300/300, but I still feel that my overall Chinese isn’t as strong as I’d like it to be, especially when it comes to actually using the language.
I’m looking for a good teacher or course, but I’m having a hard time finding someone I really like and trust. I’ve been considering Chinese Zero to Hero because I’ve heard a lot of good things about it. However, I’m not sure whether I should take the complete HSK 1–6 course and work through everything systematically, or only get the HSK 1–4 bundle and find another resource or teacher for HSK 5–6 later.
Taking the complete HSK 1–6 course would be quite expensive for me since my budget is limited, so I want to make sure it would actually be worth it before spending that much.
So I’m wondering:
• Is Chinese Zero to Hero actually worth the money, especially for HSK preparation?
• Would taking the complete HSK 1–6 course be a better choice for improving my Chinese systematically, even though I’m currently preparing for HSK 4?
• Or would it be better to buy the HSK 1–4 bundle and then find another resource/teacher for HSK 5–6 later?
• Would it be better to spend that money on a good private teacher instead?
• Are there any affordable teachers or online courses you would genuinely recommend for someone who wants both a high HSK score and better overall Chinese?
I’m not necessarily looking for the cheapest option — I just want to spend my money wisely and choose something that will actually help me improve.
I’d really appreciate recommendations from people who have actually used these resources or studied with a teacher. Thank you! :)