Should I change my PhD advisor when I find I got not enough advising?
There are some students who don't need a lot of direction and can find and analyze their own research problems. There are others (many others) who need more direction and even suggestions about problems. Likewise there are advisors who want to give a lot of direction, sometimes too much. And their others who don't, or who prefer to work only with their most advanced students. It can be a problem if there is a mismatch. 

The two ways of curing the mismatch are begging for help and hoping that the advisor responds positively, and finding a different advisor who is more helpful at the point at which you currently are. 

Perhaps your advisor depends a lot on those senior students and postdocs to give direction to the newer members of the "team". If you can find and exploit that help there, you can probably be successful. Otherwise you should consider your options for another advisor. 

Don't spend a lot of time hoping it will get better. If you, or someone, takes some action that seems to be moving in a positive direction then you may be able to see what happens. But if nothing does, protect your options and your future.