Min-maxing is popular in many online game, that is, minimize certain stats (hence lowering the levels) and maximize the attacking stats (hence the damage). It is popular in MMORPG where a player purposely omit trainings in certain skills to minimize his/her level fooling other players into thinking that he/she is an easy target, and when being challenged, dealt extremely high damage output killing the poor bully in a duel or PK (player killing) session with the bully wondering what just happened.
Min-maxing is possible in War of Nations as well, especially during the early stage in a newly opened world, and is not as feasible during the later stage. Why do you want to min-max in War of Nations?
The reason is simple, firstly, it will not be efficient for players who are 5 levels above you to attack you, while on the other hand, you can probably decimate any players around your level or even a few levels higher than you. This means that you will be indomitable for a brief period of time provided that you keep clear of the super high levels (well, coiners).
Before I go further, we have to understand how your experience points is accumulated in War of Nations. Building upgrades and researches will push your level up, gaining Attack Points will gain you some experience as well, but limited to a certain extend. I am not sure how it works but I did gained a few levels after I stopped upgrading my buildings and focused on just attacking in one of my games.
So the trick for min maxing in War of Nations is simple. Keep your buildings to barely meet the research requirements and production output that you need. The first stage is to skip as many researches as possible and go straight to Hawk, remember you do need the factory levels though. Example, you just need tanks, helicopters, hailstorm, arachnid (just to use up the Uranium), and possibly rocket trucks, so you skip the rest and go straight for Hawks. Do remember to upgrade some factories to the appropriate levels to produce Hawks.
In one of my game, I was rolling with Hawks when I was about level 16/17, pretty amazing I would say, even killing players with more than 5 levels above me. After getting Hawks, skip the rest and go straight to Artillery. When you have the Artillery, and especially if you get them earlier than the rest of the players in the world, hopefully, you can get them before hitting level 25/26, this will give you tremendous advantage for a brief period of time, and it will probably propel you to the top 50 players in that world.
The effect is even better if you spend some gold to buy Elite Recruit packs– hitting players with rare or higher commanders. If you have more gold, you could probably get to Artillery even earlier because you do not rely on your own iron, oil, and fuel production to have enough resources for the Research Center upgrades and units production.
Enjoy this brief period of invincibility (almost), and get yourself into the top alliance in that world, and you will have a smooth sailing game play there.