If satan is alive

"6 Humble yourselves, therefore, under God's mighty hand, that he may lift you up in due time. 7 Cast all your anxiety on him because he cares for you. 8 Be self-controlled and alert. Your enemy the devil prowls around like a roaring lion looking for someone to devour. 9 Resist him, standing firm in the faith, because you know that your brothers throughout the world are undergoing the same kind of sufferings."
1 Pet 5

If 2 Tim 3:16 is true, and this verse conforms to it’s claims, how do we respond to what it says about satan? Some responses I’ve encountered or personally tried include:
- Cover the eyes – I don’t see Satan, he can’t hurt me.
- I see Jesus, nothing else matters.
- I’ll deal with that later.
- Satan is alive and incredibly dangerous, devious and enraged at all Believers (see fallen agels passage in Revelations 12:7)

If we assume the last stance, as I recently have, then how are we to respond?

Questions:
Q1: This passage begins with "Humble yourselves therefore..". Why humble and what is the "therefore" referring back to?
Q2: If satan is constantly prowling around, looking to devour/harm us, is there ever a time we get to relax, let down our guard?