Well that's all you can do! And that's the most important part, as you already know. But it's nice to be reminded of it by others!

Dust off, and start again. Every day without SH is the potential for passing the previously longest streak.
I did some (very light almost inconsequential) burning other day- two, three weeks ago- not even sure. First time in a long time I'd intentionally started to burn myself, and if I hadn't had someone walk in on me I might have made a better go at it. I'm a hitter/burner, btw.
Anyway I haven't given it much thought- and if I'd actually done a decent job of burning myself, really the only worry would be 'am I going to heal on my own' as well as a little healthy self-horror at what I'd done. I've never counted days, never saw myself as having to achieve a number as far as SH free days go. Once I'd got out of the habit of doing it nearly every other day, if I slip, as long as it's not severe, well I slipped and I'd better not do it again on account of I can't afford to make a habit out of it again, and I move on.