macbook pro cannot start

hi, my macbook pro 15” with the touchbar can’t start and it keeps flashing the folder with the question mark icon. i tried rebooting it by pressing command option r keys and tried to first aid all the disks but nothing works. i was just editing videos and my laptop’s just been with me for around half a year and i’m disappointed that it has encountered quite a few problems. looking forward to your reply!

thanks!