Keeping this post super short and simple. Always do the best you can do. That's all you can do.
Wherever your life and career takes you, give your 100% best. The gigs may change, who you work for may change, but what should always be consistent is YOU, and your effort do give your very best to every single project you have the privilege to work on.
Normally, you can feel it when you're in a good fit. This is when you feel respected, loved, and taken care of by a great team. Your best interests are their best interests. Your success is their success. They're invested in you, and you can feel the love and warmth. This is the way it should be.
That said, if you find that your best is not enough for someone, and you've given your all, don't torture yourself. Doing that will actually make things worse, because you'll be putting in all this extra effort, for little to nothing. The odds are, no matter what you do, things probably won't change. If you find that you are being treated differently than others, if something feels off, if you feel coldness instead of warmth, always trust your gut - It may be a sign that you need to find someone else who empowers you; someone who appreciates you and your efforts more.
It took me years and years to arrive at this simple conclusion - Life is short. It's not worth the stress of going through hell and back for someone when the effort isn't paying off. Some things in life are just not meant to be. Some people in life are impossible to please. Don't allow a toxic experience like this to beat you down - just know you deserve better, and you will find it. There's a better opportunity just around the corner - Move on!