At your level, it's hard to do Midgard/Bifrost quests without the help of a high level. Try to see if you know anyone that is willing to help you complete all the quests 3 times.
Bifrost quests mostly require you to wait at the top behind the lasers while the person helping mob from the Iris to the top and then kill them all with 5th. Valhalla requires you to have IR so that the person helping can IR you to the top.
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