If the promotional video isn’t good, __________

Which of these work? How would you correct all of them so they could all possibly work? Could all of them work? Which is natural?

If the promotional video isn’t good, it will tarnish the project.

If the promotional video isn’t good, it won’t take the project seriously

If the promotional video isn’t good, the project won’t be seen as credible.

If the promotional video isn’t good, the project will lose all credibility you work so hard for.

If the promotional video isn’t good, it will discredit the project/the project will be discredited.

Is it natural to say in any context : “x won’t be seen as credible”? Could you give me an example?

Is it natural to say “lose credibility you worked so hard for”? Can you “work hard for credibility” or is that incorrect?

Is it correct to use discredit this way ? In the active voice or passive voice?

thank you