So I'm finally into the DZ. Got a GS just shy of 100. But I've been having trouble because of campers. A group of folks waiting just outside the DZ01 entrance who rush over to kill everyone at the extraction point every time. What can I do? They've made it impossible to get anything out of the DZ & I'm loosing ranking & money because of them.
The drastic option is to leave the dz, login again. There are multiple instances (depending on volume of pkayers), so you'll get a different instance.
Once you get ganked going thru dz01.. don't go that way again.

note there are one way "entrances" along the barrier.
As for extraction, don't hang about. Some of the extraction sites you can wait off from a distance and see whether any teams come looking. Then time it and run in if it looks good.
Also, extracting when a supply drop is nearby is easier. They are more likely to go running for the drop than the extraction flare.
Oh, if you're soloing, then yes, you're on the menu.
Edit:
Oh, don't hesitate to try multiple extraction calls should gankers turn up. Sometimes they could not be bother coming back when it is empty.
If you know they'll show, call the extraction, and run immediately to the next extraction site and extract from there. You'll be extracting there while they are waiting for someone to show back at the first extraction.