Remote Access over Mobile Network to Mikrotik

Hello,

Remote Access to the Mikrotik Router over the Mobile Network (LTE) and Internet

I'm using a provider with a PPTP Tunnel possiblity (portunity.net), termination on the Mikrotik.
WAN=PPTP Tunnel= external IP-Adress.
Access work with port forwarding to http://xxx.xxx.x.xxx:5555/

How is the best access to the Mikrotik from everywhere?
Script .. best solution ...

Best Regards
Hubert