As important as whereabouts on the map to play is the table underneath the map: how many troops you have and how many reinforcements. You are good on reinforcements but very weak on troops. Eg the guy who is getting nearly 30 troops to deploy could wipe you out in 2-3 turns in theory. You need to focus on building your strength & hopefully keep quiet in the background while red and green fight it out. So you can either decide to build up in Asia, or to finish off blue in Aus & build up there. Either way you should be deploying some troops on key regions for defence every turn (key regions for defence ar either regions on the borders of your bonuses and/or regions that assault many other regions, eg China). In an ideal scenario, after a few turns you will be strong in either Oceania or Asia (ie have stacks as big as your neighbours) and be able to re-take the area you left as second priority. When there are 3 players left on the map, & you are not far behind the leader in strength, you look again
In flat rate games you should aim to end each turn with more troops than you started the turn with.
PS You don't have a treaty with the Europe dude, just a short term understanding while it suits him. Trust him as far as it suits him to hurt someone else.
Enjoy - it's a great map, & it looks a fun game where you have done good so far.