Ask HN: What do you take in consideration before submitting to HN?

I've recently joined HN and I've posted once since then, in the Show HN category. I didn't receive any feedback which I find normal considering that I am really new here.

This made me wonder: what makes something succeed in HN? I'm sure the quality of the link surely matters a lot (probably the most), but there's other variables that matter a lot too. Things like:

- Title

- Just link vs text with a link

- Time to post

- Karma? (I don't know if it's important for submitting)

- and many others that I don't know of but you surely do!