I dont know from where i should start :
but as long as gameforge asked for some feedback from old and new players , then here we go guys , as a player for over 6 years and a streamer got alot of ideas and some complains i should talk about and also i am one a reason that i brought some old players back to the game and some new players too , but when you bring players for the game while you are not enjoying it anymore it wont help the new players right ??? when they comes and see me complaing a lot about it , they will be WTH ??!!!
so i hope you take it seriously and try to help the majority of the players to make this game more great as it was ( not now , not before 2 years ofc )
1- Dungeons
as most of the players were talking about the loot and how the dungs start to be easy to be cleared and old enough to not do it again ,
1 - i would like to say if you can add 1 more option for each dung ( such as extreme option ) but for endgame geared players to get high end loot to keep up the gearing for them and to make more fun for the players to keep playing different dungs
2- remove the idea of ( you need this item go make this dung ) ( you need other item go make that dung ) ppl wont have all day to farm 1 or 2 for each item then need
3- fix bahaar dung for high end loot and more HP
4- LOOOOOT LOOOOOOOT FIX IT AND MAKE IT WORTH TO PPL FARM IT
5- AQ dung needs alot to be fix specially the loot ( the new feedstocks and for ring and earnings)
6- coins system is baddddddddddddd
2- Vangaurd
now we need to talk about vangaurd window and the rewards
1- the rewards of each dungs you do its so old and not worth to get specially the gold ( i know you raised it from before but still not good compare to what we lost from HO patch )
2- daily and weekly rewards its the most joke ever , that you dont need them anyway .
3- Exodor
the story line i wont complain becoz i think you cant deal with it , but:
1- the agrro you draw from mobs its so bad ( from 1 KM you draw agroo)
2- how mobs are really close to each others
3- the rewards from dailies are not worth even to waste 1 to 2 hours to finish that
4- the HP of the minions and bams are soooo high ( specially for lancers and healers to kill )
4- General changes
This is the best part , WHY ?? becoz it is most of my chat and friends opinion not only me :
1- first thing and that should happen from you gameforge is : unban old players who did mistakes and wanted to come back , whyy becoz we are losing players and giving a chances to ban ppl it will get more players and help the game specially who knew and sent tickets by knowing there mistakes . ( we all do mistakes but we learn from it ) 
2-fix the upgrading old gear like ( daylight jewelries or older ) , its old enough to be hard to get and not to waste alot on it
3- reseting skills after we wipe or the boss got reset ( i dont have to wait more time if we made a mistake or wiped for my skills such as enrage or brooches ) that would make it more nice change 
4- make the cards more easier to farm, ppl wanted to play and to make changes for there chars , i dont know why when you add something new to the game you make it waaaaaaaaaaaaaaaaaaay long and hard to get, where is the fun from that , and what is wrong from getting it more faster and makes our char more better )
5- EP and Skill ADV , same thing why you make it sooooooooooo slow , it will be much more better to make ppl get points faster ( thats would make ppl to play more chars and thats mean more time in tera , so thats what you wanted from us to do ( more time in tera) so more alts more time
6- Ghilli loots are so old and need more buff to make ppl get TC to do it 
7- lets ppl get more xp to reach lvl 70 faster , how new players or old players will come back to the game if you didnt make it easier for them and us ( EP - Skill ADV - Card system - XP to 70 - PET to partner ) loool they will run away if they know that they need to get all those slowly 
and there are alot to say but those are the most i cant say so far to not get ban 