What shall I do? (Ti poiēsō̱). Deliberative future indicative or aorist subjunctive (same form). This detail only in Luke. Note the variations in all three Gospels. All three have “will reverence” (entrapēsontai) for which see Matthew and Mark.
It may be (isōs). Perhaps, from isos, equal. Old adverb, but only here in the N.T.