What can I do to protect myself (TW sexual assault)

Last month someone attempted to sexually assault me at night while I was walking in a park, I managed to overpower them because they were an older person but I don’t think that I wild stand a chance against a 20-40 year old man. I’m in Canada so I know that self defence is frowned upon by the law and I don’t know what I would legally be able to do/cary to protect myself.

More information: I am a 15 year old from BC Canada, the assaulter was not someone I knew and it was just a random person who started following me at night and tried to grab me. They were caught and arrested, I am not worried about them but worried in general