A few thoughts before we begin:
1) Make sure to talk to every player every turn. This is just as important for neighbors (with whom you need to actively coordinate) and with far-away powers (who can provide valuable intel as well as be used to help influence the board to your liking). There are, of course, scenarios in which you'd not want to talk to a player, but unless you have a very specific reason not to, you should be maintaining communication.
2) Understand what the board is telling you. Communication is, of course, a major part of the game, but board positioning and movements cannot be ignored. This is usually obvious when looking at your neighbors moves (for instance if you're France and England has just moved into the channel). But, to be successful, you need to look at the *entire* board and understand how the dynamics on the other side will impact you.
3) Plan your solo from the first year. Your plans will certainly change, but unless you are playing with terrible people, it will be hard, if not impossible, to solo even from a strong position if you don't start planning until the mid game. Build relationships with people you will need in the late game and sow mistrust between players that will need to cooperate to stop you.
Looking forward to a great game. If you have questions throughout, please feel free to ask.