Replying to Fibulas pop out of place pls send help

My fibulas partially dislocate or (what feels like) totally pop out when I’m skiing and biking. I just kind of push on it until it gets back into place but I often can’t do it on my own and it feels badddddd. I have worn soft knee braces and tried taping but they still pop out.

Has this happened to anyone before and do you have any tips for prevention and recovery? I know I should go to physio but it’s really expensive where I am so I’m trying to get it sorted on my own. I figured the NS gang has had their fair share of knee issues so could give some insight. Cheers :-)