Keep yourselves (heautous tērēsate). First aorist active imperative (of urgency) of tēreō. In Jud 1:1 they are said to be kept, but note the warning in Jud 1:5 from the angels who did not keep their dominion. See also Jam 1:27. In Phi 2:12 both sides (human responsibility and divine sovereignty are presented side by side).
Looking for (prosdechomenoi). Present middle participle of prosdechomai, the very form in Tit 2:13. The same idea in prosdokōntes in 2Pe 3:14.