I've noticed that a lot of the toughest 500NL regs 3-bet a lot more from the BB than I do, so I would like to change up my 3-betting range a bit.

Seen some top level players 3-bet hands like 54s vs BTN, squeeze 65s in the BB vs BTN/HJ etc. This is something I never do.

What's a reasonable range to 3-bet with from this postion?

Should I treat it like HU play, where I 3-bet big hands (QQ), hands that play very well in big pots (KQs), but I do also 3-bet hands that are a little too weak to call (K4o, 65o etc.), and at what frequencies should I 3-bet hands like T9s/89s/54s etc.?

How do you play the BB versus other positions?