Unfortunately the best solution is to try and limit your building to worlds with your region, which for UK would be EU based worlds. Flan, being an AU world, is probably the worst option to pick ping wise.
As an Australian I get the same problem on EU based worlds; sadly there isn’t really a work around.
No, unfortunately there is no way. You have to look for the server which has the best connection to you and base there. We were on Flan for a week, did not work for us~
get a VPN service like nordvpn and find a server that is close to the planet’s server you are interested in. Specifically a VPN server that you have a good connection to. This should get you a good connection to the planet.