I have some philosophy works that I want to see improved into a more succinct, scholarly text. Where can I get such help (for free if possible)?
Nobody who has the skillset to do what you want is going to do it for free. Professional philosophers and advanced grad students are pretty busy people. Would you ask a medical doctor to help you with your medical article for free? Would you ask a lawyer to help you with your law review article for free?
semester is about to start; go join a university course asap and ask your tutor if they will help you work on some essay/s that you have already started work on. they won't be obliged to help, but they might be willing to if they think it will help you on your course.