It's not clear what gear or rotation you are using but I once calculated ability metric for a Breton magicka sorcerer as a function of CP. A summary table is shown below. This was assuming 5 TBS, 3 Willpower and 3 Julianos.
So you are around 240 CP (115563 ability metric) and if you reached the current CP cap, 561 CP, you would expect a DPS increase of ~19% (metric for 270 CP is 137604). Since most good max CP players will get around 30k DPS for a single target, I would expect you get around 25k ish, maybe a bit lower on longer fights due to sustain issues.
It sounds like your problem is with getting a good rotation going. If you are on PC, learn to examine your DPS parse if you aren't sure how to do that post one here and I'll try to give pointers.
Edit: The gear used for the calculation is not optimal. It was just something I thought was easy to get at the time to allow easy comparison and avoids the impact of CP on proc gear sets.
Im currently cp 250 something. And my dps is pure garbage. So my question is, is this game going to magically allow me to do more dps when im higher cp? just because of the fact im higher level, so I will hurt the monsters more?
Could I have the same build at cp250 and do crap dps and the same build at 561 and all of a sudden my dps will be better?
The reason I ask is because, I've asked before and gotten the response "cp has alot to do with it" multiple times
Im a mag sorc and already have a 21% dmg boost from elemental expert, and as far as I can tell the only way I can weave is with light attacks/force shock and when I do that its actually reducing my dps by about 2k, so im stuck in around the 11-13k dps range and not seeing it get any better