Well done! Great feeling isn't it?!
I've been at target for just over a year now - lost almost 4 stone with SW.
The official line is to add in HEs and try not to build up the syns too much. There's a target members area on SW Online.
What I do is try hard to stick pretty much to plan most of the time so I don't need to stress if I have the odd day, weekend or two week holiday off plan. I have the odd piece of cake when there's a birthday at work, a couple of glasses of wine a couple of times a week, fries at lunchtime now and then.
I also know my own triggers. I can't have just a couple of biscuits. Bread bloats me ridiculously.
I weigh at home every morning but only pay real attention to the weight on my official weigh-in day IYSWIM. That allows me to relax about a small gan and when when I need to reign it in.
Ideally, I try to be 1lb or 2lbs below target, but in range, so I have some flexibility. I'm at the top of my range at the moment following a great foodie holiday but I've never weighed out of range.
Finally, do still go to a group if you can. I weigh every two-three weeks and try to stay at least once a month.