Lvl reqd to complete the Gatekeeper Quest

Hi, I have completed all the quests and have now reached the Dark Castle and started on the Gatekeeper Quest at Lvl 15 with Hp of 68 (I lost 120 Hp while getting the elixir), my SP is 30, Xp =220785
Nxt Lvl XP = 240000
Just as I exit the Dark Castle I am confronted by the Orcs after my dialogue with the Maje Council Leader (Mysterious Man)....problem is the Orcs are hammering me, my shield broke and they are relentlessly bashing me
Am I having too low a lvl for this quest? Can I not take on the Elixir quest at present and complete that later, I have a feeling that will save my Hp and help with the battles.
How do I lvl up? I have completed all the quests in all the cities. pls advise.
Nxt Lvl XP = 240000
Just as I exit the Dark Castle I am confronted by the Orcs after my dialogue with the Maje Council Leader (Mysterious Man)....problem is the Orcs are hammering me, my shield broke and they are relentlessly bashing me

Am I having too low a lvl for this quest? Can I not take on the Elixir quest at present and complete that later, I have a feeling that will save my Hp and help with the battles.
How do I lvl up? I have completed all the quests in all the cities. pls advise.