Why is my store customization not working?

For the past 2 days i’ve been trying to customise my store but i wasn’t able to do so because it just said : something went wrong please try again a few minutes later

Have you tried to login your store and customize using another browser or using Incognito browser?

Yes i already tried those, now I’m thinking maybe i should try customizing
from another device like my computer that could probably help.