When you're in the blinds facing a loose BTN opener in 6 max nl. How do you adjust vs. villain? A few ways I think we can adjust is by:

1) 3 bet lighter from the blinds if BTN has a high fold to 3 bet %
2) Tighten up our 3 bet range from the blinds if BTN has low fold to 3 bet %
3) Tighten up our calling range from the blinds with more value hands

Is there anything else we could be doing?

1) I agree with this, but you shold be 3 betting a **** ton whether the person has a high steal% or not if they are folding a lot to your 3bets anyways.
2) semi agree semi disagree, I wouldn't be tightening up perse more just 3 betting with a different range, instead of 3 betting small sc's / small pp's that you would 3 bet against a high fold to 3bet% you would just loosen the bottom of your standard value range to more facecards, mid pp's etc stuff with more showdown value.
3) Agree with this also, dumping low pp's (I don't use these in my standard calling range anyways from the blinds usually) but I would just be opening up the bottom of my range to more showdown value hands sinec you will be dominating more hadns since his range is so loose.

Overall I think your strategy is pretty solid.

Thanks. You said you would 3 bet with SC, small pp. I'm thinking we could add in more Arags (suited). What other hands do you think we could 3 bet light with?

my standard range is small sc, Ax obv better if sooted, Kxsooted, very situational dependent but small PP, along with my standard top 3% of my range or watever.

Anything with blockers is good, I throw in small SC to widen my range against certain players.

I have a bad habit of 3 betting out of the blinds to much but I think I read somewhere that your 3bet% range should be like 70%ip 30%OOP is somewhat standard.