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After you finish your 30 days of writing, try to forget about it for at least a week. Then, if you want to revise, or if you have more writing to do to complete your first draft, you can continue working on it! The break helps you see your story more clearly and make decisions that will improve your novel. Don't look at it or talk about it, and try not to think about it too much. That way you'll be able to return to it with fresh eyes and a clear head when you start the revision process. Tell your readers to be as honest as possible with you. When trying to figure out how to revise your novel, it can be very helpful to know what others think about it. Ask your readers what they liked and didn't like about the novel. You can also ask things like, "Which characters were compelling and which were annoying?" and "Did the plot make sense?" If you think you might like to try to publish your novel, you might want to expand it. 50,000 words may be a lot, but some publishers will want more, depending on the type of novel you're writing. Research average word counts for the genre you're writing or aim for 90,000 words as a good benchmark. By knowing what parts of your novel are worth expanding, you'll have a good idea of how to move forward with it. Ask your readers which parts of the book they wish were longer to help figure out what to expand. When writing a first draft, there are always things you won't end up liking. Be honest with yourself about what really isn't working in your draft and decide to fix it or cut it entirely if necessary. Even if you're emotionally attached to a certain character, scene, or subplot in your novel, you may have to cut it if it isn't moving the plot forward. Having reactions from trusted readers and a plan in mind, you'll be ready to return to your novel. You probably won't have to write at the furious pace you did to finish your draft in 30 days, but you will still want to have goals and a routine for yourself. You can start revising at the beginning and work your way through the whole novel or work on sections out of order. Whatever makes most sense for your process is fine! If you end finding that you want to start your novel over from scratch, that's fine too. But don't think of your 30 days of intense writing as wasted time. You've learned a lot about the kind of novel you want to write and how to get writing done efficiently even if you don't go further with what you wrote!
Take a break when you're done. Get feedback from people you trust. Figure out how you'd like to expand. Decide what you think doesn't belong or doesn't work. Revise your draft.