No, I'm sorry, this is a braindead take.
Squidward was a pretentious jackass and narcissist who thought too highly of himself. He wasn't "burnt out," he felt his job was beneath him because he was a "misunderstood artist."
He sucks at clarinet but thinks he's amazing. He sucks at art, he sucks at dancing, he sucks at everything, but he's convinced he's some genius just waiting to be discovered.
He's a miserable cynical jackass because he refuses to acknowledge that he's kind of terrible and treats everyone and everything as beneath him.
Remember: no one wants to be a Squidward.