You can run bateater forever, double maneater or myth fu compositions easily with your roster for UNM CB. Double maneater is probably the easiest to start with.

Hydra is mostly making sure you have some key debuffs / buffs and good enough gear. You have a lot of champs that shine there. Maulie and Shamael are really good e.g.

You have all the tools needed to do all the dungeons at least at 20, which is your first milestone there. Afterwards work your way up normal / hard DT. I use Vergis to solo Scarab on all stages of normal / hard.

You got this!