When I need technical work done such as podcast editing or copyediting, I rely on Upwork.
I have used these services for a few years now because they provide great value and great results.
The quality of the results is based on the individuals you find and task.
Both resources have a lot of talented people you can find with reviews, ratings, and skills you are looking for. I often filter to the most experienced people in their field who are very actively doing their craft really well.
The rates are very reasonable and you can even pay per task completed.
Keep in mind the remote workers need some context to complete the task you assign to them. Most will iterate the work they produce if you present feedback on what needs enhancement and how.
Most will iterate the work they produce if you provide feedback on what needs enhancement so they have some direction.