I'm not a mom and I've never been a mom but I certainly admire anyone in that position. I think that what you describe can be shared by soooo many moms. It must be overwhelming to be in charge of a whole person. And exhausting. Do you have any relatives who could give you a few hours to yourself? Or maybe a kind neighbor?
There is time left for you to do something big. You need to first decide what that might be. You can't have a plan without a goal. Maybe that could be your first goal. Maybe you could say that in 6 months time I will have 3 directions to explore. Think deeply about what these can be. Then maybe you could choose another time to narrow down your 3 choices to one. Then you can make a short term plan and a long term plan. This gives you time for your baby to get a bit older and time for you to sort through your ideas. This is real work that you can do to achieve your goal. This isn't empty gestures. Most people need a plan in order to achieve something big.
I hope you find your dream and make it come true.
Good luck