If we're offering generic paint-by-numbers advice, I'd say that in a typical 1/2nl game that is limpy limpy we should be raising from the HJ, CO, or BTN (one of these spots once per orbit) with basically all broadways, 99+, and 10% worth of our favorite middling SCs and S1Gs (suited 1 gappers)
The real answer is it depends on the table dynamics and if our villains play their hands face up post flop and are fit-n-fold (which 95% of them will be).
We also need to be sensitive to the frequency we do this. I've personally found that if we raise just once per orbit, most villains won't pick up on that. However, if we raise more than once per orbit, our villains tend to notice. If we raise 5 times within two orbits, then our villains will definitely notice.
I personally like to have a sliding scale when I'm raising. I like to start off super wide and then with every subsequent raise tighten my range.
Reason being, our first raises generally get more respect, but if our frequency is a bit high then villains start to notice, then they start to verbalize like, "you're raising again? I knew you were gonna raise..." once that starts happening villains are definitely gonna start looking us up.
Obviously we can't control when we are going to get our big hands, however, if we are sensitive to the table mood then I feel the optimal strategy is to hover right at that threshold raising frequency of three times per two orbits (or whatever the table lets us get away with before we encounter resistance). Then when we do get a monster hand we are more likely to get action ESPECIALLY if we pick up that monster hand right on the heels of raising with our more marginal hands. So that monster hand tips our raising frequency over the limit that the table will bear and now they are in call down mode and we get action on our big hands.
This is something that I'm very good at. If we are mindful of that frequency and are hovering "right" at the edge of what the table will accept, then when we get that big hand it will push us right over that edge and we will get more calls when we want them the most.
The last point I'd like to make is that even if our villains do notice, they don't adjust very well. The way most villains adjust at this level is just by overcalling, or limp/re-raising their monsters. The one adjustment that they rarely do is 3-bet light. That rarely happens in LLSNL, so when we do raise and we get 3-bet we can fold with a high degree of confidence that V has JJ+, AK and usually it will be AA/KK 50% of the time and QQ/AK the other 50%.