It appears that you are having difficulty at crouch jumping over boxes. You can achieve slightly higher jump heights as a human by pressing crouch as you jump in game in order to get ontop of specific crates. This requires a tiny bit of timing but is a common skill set required to play any source game.
I would advise loading up the developer console via your game settings and enabling it. Pressing the ` key (key beside 1 at the top of your keyboard) and typing in the following "map ". Pick a map you are struggling to jump on.
Run the following commands in the console once the game starts in local mode. Ideally store off a .cfg file in C:\Program Files\Steam\steamapps\common\Counter-Strike Global Offensive\csgo\cfg and then open the console and type “exec <filename.cfg>” once your game starts. This will execute the commands stored off in the config file all at once so you don’t manually have to do it.
// Config for server
bot dont_shoot 1
This will allow you to try out any zombie escape map and practice how to do parts of the map such as crouch jumping. If you have any questions let me know. Otherwise best of luck in your jumping adventure!