Please solve this, its difficult level up without quest

There's really no more auto-quest, as there have been some changes from Main Quests per Character, to Main Quest per Family, or something like that. Meaning, that you only need to finish your Main Quest using one Character, and based on the screenshot that you have, you're not that a new Adventurer, as your Main Quest icon says you're around Mediah Region. Your current/farthest Main Quest is also shared with all of the Characters in your Family. That's why the beginner's quest or the one in the Balenos Region is no longer available when you created a new Character.

 

I would suggest attempting to finish your Main Quest with your strongest Character up until you were able to unlock Hadum's Realm before creating alternate Characters, so it will be easy to level them up through grinding and not through questing.

This ain't a bug.
[March 22] Patch Notes

It's insane that this is intentional. What other game has ever just flat-out prevented players from replaying it?

Vanlaren, why would you want to redo the main quest? I wish it could be skipped all together. There is literally a WALL between you and the game for days in the form of the main quest. Questing needs to stop in these games, just let us play!