Some good spots were already mentioned above.
Here is a bit of more general advice. If you have the carry capacity, loot as much as possible. Learn what sells the least, and start destroying that stuff when you run out of room (if you aren't planning on leaving to sell). You can make tens of plat just doing that in the low levels for quick spell plat or w/e.
In Unrest, for example, the death beetles drop
https://wiki.project1999.com/Amanita_Phalloide, which sell for like 14 plat per stack of 20. Not bad for a stackable item with low weight, and it drops from what you are already XPing off of. Unrest mobs also drop bronze weapons and banded armor.
You can camp some shralok packs if you need more capacity, and you can sell them to other players if you want.