I think hitting to toes would be more dangerous, since there's lots of bacteria there. If you have lots of clean syringes and cleaning alcohol, it might be OK but myself i wouldn't go there.
Most infections i have seen have been on leg area. I know one dude who had to had all his muscle carved out because of hitting to leg. Now walks with sticks, has still his feet, but it's intact only by bone. Super disgusting. Other friend had his entire feet go super fucked, his hand was too. I have pictures of that before and after, he had to go to surgery.
Hitting to neck can be pretty safe if you have friend who knows what he is doing doing it for you. If you have veins in your chest it's actually much safer, so i'd try there first. If you're women, you will have veins in your boobs which are probably very easily visible, specially if you have big bad boys.
Wouldn't suggest going for the neck full time, maybe just take a break or as
@The Wizard of the Creek suggested just go for the plugging for a while. I stopped for a year and after that it was much easier. I really wish i can stop in the end.
Good luck.
I will add some pictures of my friend before and after surgery to remind everyone to be smart.