after deleting maintenance, nothing shows up in my wordpress website

Hi I was working on the wordpress website for my project and, it says that it is in the brief maintenance mode, so i just refresh until it works. but now, there is only blank screen not a dashboard. I am really worried about if everything is deleted. Following the some instruction, I deleted the maintenance file from the ftp file. In my account, there was 2 wordpress access (wordpress, and wordpress 9). I can only access to the wordpress 9 that i was not working on. Since I spent so much time and effort on it, if everything gone, i will cry…