Your problem is that you started with Lunia really late. One year ago the bottom line of Myth gear you could sell was Wildur or Zugren equipment. Now itīs probably M5 or M6 gear, which is most likely pretty expensive for a new player.
To get better equipment, you could try to join other players to clear Myth with you. The more players there are in your party, the higher the chance for a battle against a Myth god. Only from their chests you get the good gear. Soloing is only bearable up to M4. On M5+ the spawn chance of a Myth god is frustatingly low.
If youīre lucky you end up in a party with a booster / farmer, who can one-shot everything. Usually these guys donīt care at all if you leech.
edit: To boost yourself further you could start abusing the cash shop by creating a ton of alt-accounts, log in once on each of them before you get the free LCoins and then gift yourself all the good stuff when allm shells out free LCoins twice a month (if that didnīt change). A lot of people do that and the GMs donīt care (why should they?).
See this vid for instructions: