The next set of quests you'll see will be in D-Terminal B2. However, you can not access this dungeon until Tamer level 50. More so, quests are only available if you're current active digimon is level 70+
There ARE quests for LVLs 30-50 on File Island, however, due to the failed patch, we don't have them right now. (JM servers do now unfortunately) And these are meant to supplement the 'grind' of 30-50 until B2 is available.
For now, simply wait, you'll get your quests eventually.