Once you get to about 1170 you can only progress horizontally at that point, the way it's designed with the slottable skills. At 900, you're probably being nerfed compared to max by maybe about 2-4% of the total potential of your capable skills, depending on your allocations and role. The XP scaling is not too bad at that level either, you accrue CP pretty fast until 1800 when progression rescales, and then it slows down a bit. Basically, with enlightenment, if you pop a 100% scroll per day and run one random normal, you'd make about one CP per day doing absolutely nothing else going up to 1200 CP.

People run normal BRP with two players to grind CP, doing the first phase up to final boss, then porting out and starting over. During an XP boost event, with a 150% scroll on and purple training gear, I found that it was possible to accrue about 4-5 million XP per hour with a partner once you get going. If you really needed to be at 1170, it could be accomplished with 16 hours of grinding in this way, which is not too bad really. It could be done in a weekend. If you can do master writs, those will pump out a lot of XP when buffed as well - I save them up for events, buff and pop a scroll, and can get 3-5 CP just doing 20 or so of those pre-1800, and it takes maybe 15 minutes tops thanks to addons and open homes with full outfit stations.

But, as everyone has already said, you don't really need to do that. All content is pretty much accessible at your level, and it might only make a measurable difference for truly gifted and competitive players. So if you are one of those, it might be worth the grind time. If not, no worries, you're fine, just play.