Unfortunately that is not an air fork so it is not very adjustable you might be able to spend a bunch of money and replace the coil for something stiffer but generally bikes like that aren't designed to to a bunch of hard curbs and things like that. Really no bikes do well there if you are doing it regularly luckily while riding you don't really need to do anything like that and if you are doing that you might change your riding style to stay more predictable. When you are weaving and going on and off sidewalks it is tough for people to know what you are doing.