I recomend greatly that Masteria became as a lvl 110 - 170 train zone since the place is really great to train. And also ading new areas from lvl 160 - 195 will be great.
Ill give some feedbacks about the new Masteria and how it will be improved with the old one:
a) The aliens.-
They are pretty well designed (even if has no death animation), but the level for them is too low... is great to increase them to lvl 105 the miners and the 2nd class to lvl 110... also we need to see more mobs about them like a two headed robot alien or a mounted alien from levels 115 to lvl 135 and the actual boss has 2 modes: the easy one and the hard one. The easy one will be lvl 120 and the hard one lvl 150. Also adding exclusie GMS armor, weapon and use recipes and why not? VIP weapon recipes and Visitor Armor recipes becoming a set will give more reasons to do the boss figth.
Actually the area is really abandoned... we have the same mobs like 3 years ago... we need to revamp all of them and becomes a lvl 125 - 145 Theme Dungeon (Ghost as the lowest level and Jesters as lvl 140 mobs). Olivia Boss was great and need to became a lvl 150 boss. The quest and some rare items to this area will make people going to do this. This need to be near to NLC maps.
c) Phantom Forest.-
This zone is abandoned too... need to be revamped and need to return the headless Horseman and the Bigfoot as a lvl 135 - 140 area bosses. Also it will be interesting to add some fearful mobs to this area. The quest and the exclusive area reciped will be a great adition.
d) NLC area.-
The ares is revamped but it can be improved more. The street Slime need to be lvl 125 at least, some mobs like the Wolf Spider need to be retired. I.AM.ROBOT need to be stronger at lest lvl 150. And ther need to be a lot of quest since NLC was revamped. Also need to be a conection to the Alien area ,the Phantom Forest Area and the unreleased Krakia area.
e) Bigger Ben.-
This area is unavaliable now but this ares needs to be really big, really great and having a strong boss (Christopher??? (the hero on the grave on the last map of the area)) will make this area great to train. Also this need to be unique and this area needs to be a Party Play Zone too. The recomended levels are 145- 160 and the boss at least 175. Also adding new mobs related the area will be great. For example adding a shadow with a clock on the back or an dark eagle, even an Harpy will be great.
f) Crimsomwood Keep.-
This area... since The old Masteria gave the best PQ on the WHOLE game need a special treatment... this area needs to become a level 160 area (to give a complement to Future Henesys) and the Castle almost lvl 180 area with some area bosses on both areas. Also the masters on CWKPQ need only to be the 1st part (along the Pirate master). To enter to the 2nd part of the quest need to have 5 items collected from each master. With all of them the players will fight to the great Naricain (lvl 185 - 195), the powerful ruler of the area. The battle NEED to be more difficult than Cygnus battle and need a lot of tactics and now only brute force. Adding some recipes like the Spectum Glasses, the Powe Mane or the Arcana crown REVAMPED (with better stats) will give atraction to the area. Also lvl 150 weapons , armors, accesories with a complete set will make people going to get them all.
g) New Areas.-
Finally Masteria is a BIG continent! the continent itself has a lot to show to the maplers... it's maybe time to show Versal as level 140 - 170 zone. Or Krakia as level 135 - 165 zone with a strong Boss.
h) Old Areas.-
China MS gave to the players the choice to visit the Masteria old maps... why GMS not? also with lot of exclusive things like new mobs or past NLC zones who wasn't explored in the present. And why not to give the "Hell mode" to the pre big bang maps? I want to see Bob the Snail as a level 120 mob.