Congratulations on reaching your target Petrol. Keep it up.
6 packs are almost entirely down to having low body fat %. Generally sub 10-12% for most people. Little lower for some. you can do a 1000's of crunches/inverted sit-ups/whatever a day for years and not have a six pack. I know at one point I was and had huge abdominals and no 6 pack due to having 20% body fat, the 6 pack wasn't my goal, more strength and general fitness, but I can't stress enough that your bodyfat is the deciding factor there, not situps etc. If you keep up your current routine you'll get there for sure.
Personally now you've gotten to your main goal. I'd look more into tweaking your routine for the long term. Looking more toward enjoyment and maintenance of the routine, while maintaining the same level of benefit. It's very easy to fall back out of your good habits once you've achieved your goal and undo all the good work and while goals are of course good things, you will run out of them sooner or later. We've all done it, miss one day, then another then before you know it back to square one. nothing will help your long term maintenance more than enjoyment in my experience. Try some new sports would be the best advice on that front I think. A workout buddy can be good too, a couple of hours workout flies by while you're nattering and there's the obvious safety improvements too.