At how many nodes was the first topping ?
Do you have a need to keep the plant under a certain height ? If the answer to that is no, and depending on how many main branches you have now, then I would not top it any more. A plant with 6 or 8 main branches is plenty bushy, and there is such a thing as too bushy, and you'll have to start pruning off many lower branches because of competition, and crowding, not to mention smaller buds, and a pain to trim at harvest time. I would think 4, maybe 6 main branches would be the perfect outdoor plant, trimming off branches pointed toward the center.
My experience, if you care. Two years ago I did not top, (and for many years before that) well except for one plant that got too tall and I feared it would be seen, I topped it at the 10th node. Those 4 plants averaged a half pound each, and took about an hour each to trim. Pretty chunky buds.
The next year I topped my 4 rooftop plants at the 5th node, removed the two lowest branches (for cloning) leaving me 8 main branches each, those plants also averaged a half pound each, but took about 4 hours each to trim. I was really not that happy with the small buds, and the extra work of trimming them.
Two pics, first one from two years ago, and the second pic is from last year.
OK, and one from this year, taken one week ago (may 22). I do not plan to top them, but I will if they get too tall, prefer to keep them from being visible from the road. I also got bigger pots, and an earlier start than the last two years, so I'm looking for a pound each this year