If one thing is for sure, it's the fact is that there will be a time when the price will retrace down to the red line for a re-test to make sure the support is still working.
It has always done this in the past (see yelow circles). It will do it again. The question is not if, but when.
Then, when the red line still works as support and it starts going up again, there's a good time to get in, in my opinion.
Numbers signify nothing, it could be at $6k it could be at $9k or it could be at $12, the exact number is not important. Understanding what your plan is and sticking to it is important. YMMV ;-)