I have addnode 54.221.200.186, 54.252.196.5 and 121.221.130.66 as per the OP, but after more than an hour still cannot connect to any of those. Can anyone throw out a few more peer IPs?
try
addnode=79.112.169.81
addnode=117.1.39.25
addnode=93.96.132.70
addnode=192.241.222.18
addnode=92.244.112.153
addnode=71.187.248.95
addnode=121.221.212.221
addnode=54.252.165.141
or open port 16100