setting
tun-mtu 2000
is not going to do you a lot of good - try it without this setting.
also, if you can ping the VPN IP of the VPS server then your VPN is functional - everything after that is routing; make sure IP forwarding is enabled on the VPS server and make sure that masquerading is allowed:
echo 1 > /proc/sys/net/ipv4/ip_foward
iptables -t nat -I POSTROUTING -o eth0 -j MASQUERADE
You might have to talk to your VPS container provider to allow masquerading.