yes, you can use a free program from Garmin called “Garmin BaseCamp”
It’s best to edit tracks using a desktop computer.
There are a lot of videos on youtube showing how to edit using BaseCamp, here’s one: https://www.youtube.com/watch?v=QGwqQjKsFMc
Or, you can email the GPX file of your track to me at email@example.com and I can do it for you. Just let me know any details about the track that will help me know what needs to be fixed then also include the horse that was ridden, if public/private, and the trail rating — I’ll fix the file and post it to your account.