Are you having fun with your manuscript?
Sometimes, in the early stages of a project, writers are so concerned with making their story good, even great, that all the joy gets squeezed out of storytelling. Writing becomes the opposite of fun. The manuscript is dry and brittle and doesn't measure up to the writer's expectations. The writer gets blocked and gives up.
If this sounds familiar to you, try this: write what's fun for you. Make your characters do wild or dangerous or impossible things. Write to make yourself laugh. Write to chase your curiosity. Write to surprise yourself. Write to fall in love with writing. Bend the rules or disregard them entirely. Forget grammar and "show don't tell." Be silly. You'll get the writing done and you'll have a great time doing it.
Make this draft your "devil may care" draft and worry about perfection later. You may find that you've written something imperfect but also wonderful, funny, and profound.