Who do you think is qualify to give advice about parenthood/life?

Nobody really... most qualified of all would be some counselor/psychologist/social worker who has studied it or experts from various fields. But even they themselves mess up when it comes to their own children. Even someone whose family life is going fine cannot guarantee you they wouldn't mess up if one condition changed. It's a sensitive matter. Personally I would trust certain people with certain aspects of it or at least respect their opinions.

Anyone's considered opinion can be worth listening to because even those without experience of being a parent have experienced being parented. But no one's opinion is guaranteed to be helpful regardless of their age or experience.

So listen politely to anyone who offers a polite opinion and evaluate what they say in the light of your own circumstances.

I don’t want advice from anyone without a kid tbh