I've played the JP server for a few days now and I wanted to suggest a few things that could be implemented and improved upon.
Weapons:
In order to get a weapon for your class you need to constantly kill monsters within your level range in order to receive a weapon. I find this to be somewhat monotonous. Instead I would add a Weapon Smith crafting so we'd be able to craft our weapons. But make it so that we cannot salvage the weapons that we craft.
Crafting:
The limitations set for crafting seems tedious. I think instead you should add crafting as a part of a skill set like ESO has and let us decide which ones we can level. In order to level this crafting though it wouldn't take skill points, but instead using EXP from using a skill line(like crafting) would auto-unlock the next level like it does at the moment. Basically if your Black Smithing was level 1 and needs 1000 EXP to get to the next level once you go over 1000 EXP it goes to level 2. You should also remove the recipes for crafting. When it comes to Alchemy and Cooking, you should do what BDO does. In order to discover new recipes you have to put in ingredients and see what comes out. This will make crafting interesting.
Dungeons:
In order to level up based off of the guides currently on the internet for leveling on Bless. You need to run the level 13 Dungeon and the level 23 Dungeon. Both of these can be ran solo. I think they shouldn't be. Dungeons are a group activity. You should need a group to run them, not be able to solo them. So increasing the difficulty for the dungeons should be added. MMORPG are about community. So many MMOs simple make everything soloable which defeats the purpose of the MMO in MMORPG. (I know some people might say "Oh, but I like playing solo" Well, this isn't about you)
Monster Log:
In order to receive these shards which can be dismantled to get the Blue Balls in order to upgrade your gear, you need to kill monsters which has 3 Tiers(usually). The amount required to kill in order to receive these shards isn't rewarding at all. I believe these shards should instead be added to dungeon bosses, and the chest at the end of the dungeon. Instead, you should add some crafting material that drops from these mobs in order to craft things for food and alchemy. That way you can add more meaning to your crafting.
Side Quests:
Side Quests offer no value to the game. They give very little EXP and no reward. There's so many, yet I avoided them because they offered nothing in return. I think they should be reworked on. Offer something more. Crafting materials, the Blue Balls, more exp. Or maybe hints on how to craft certain recipes for Alchemy and Cooking. For instance: You receive a quest to go kill some dragonflies. After you complete the quest the NPC might tell you "Dragon flies wings are used to make HP pots. You just need the Wings, Sugar, and Wheat" It could make the side quests have more value.
Combat:
I found the combat slow for most classes. But, this has already been reworked so there's no point in talking about it.
Gathering:
I enjoyed the gathering. I find the fact that I have to purchase multiple pickaxes and gathering tool to be redundant. I think instead you should add durability to them instead. BDO does this with their gathering tools. I think this would workout well for this game as well.
PVP:
I think the disable-PVP pots should be increase to 1 hour instead of 10 minutes. But do not add PVE servers. There's no need. PVP pots are good enough.
Taming Mounts and Pets:
I like that you can basically tame any monster in this game. It's unique, what I don't like is the Space bar smashing while taming the monster. I think you should add a WSAD type of macro for taming, but keep the time limit. Also increase the chance of upgrading a pet to a new rarity a bit. I found the fail rate very high. 15% success using the same monster when they're both level 10 feels like a cheap way in order to get players to spend IRL money to increase the chance of it succeeding.
Add Fishing:
The world is massive, and I like games with big open worlds. But there's nothing to do. I feel like adding fishing to the game could offer the players something to do when they're bored and don't feel like pvping or pveing. So fishing would be something that could be looked into adding into the game. You can also add a way to craft boats for players as well. Navel PVP can be pretty interesting and you could add a world boss in the ocean as well. You could also add achievements for fishing as well.
I can't think of anything else right now.