It's common among PhD students to worry about whether you have enough.
It's good to explore new things, but if you are just adding more and more (out of fear) then you can end up with too much data and not enough time to analyse it properly; reducing rather than increasing the quality.
Instead, think about the minimum you need. Given what you have, what do you need to do to make it submittable? Go through the data, do the analysis, get feedback, publish...
Then you can think about adding more.
See also:
What to do when your PhD project gets too big
