I have the same problem. I have two sites hosted with this service and neither are working. I assumed this was due to the amount of traffic, because one of my sites is decently popular and is visited often, but one site is a (currently) private in-development site. The only one viewing it is me, so it can't be traffic.
Using https://check-host.net/ shows that all sites hosted on 000 are down, regardless (https://check-host.net/check-http?host=https://nirvanaforyou.000webhostapp.com/ shows your site timing out, as well as both of mine)