Only bluff those who fold. After a few orbits at the table or with some notes on players, You will know who folds and who doesnt. Bluff the ones who do with greater frequency and value bet the ones who dont. Simple game
I find that you will see a ton of loose passive pre flop players who fold a ton on the flop when they miss. Spot these players and c-bet them a ton
On the flip side you see a ton of players who call with gutshots, Ace high and everything in between. Value bet these players with less than stellar hands such as middle pair and sometimes bottom pair to make them pay for draws. You can also bet much larger for value as they are likely to call any bet sizing with all their range. Odds
mean nothing to them really.
In short, bluffing is essential to increase your win rate, but if you never bluff and only play ABC stlye poker at micro limits, you should win some, but not as much as you could be