as archer you should reset to no stats other than DEX.
You should doublestrafe monsters in Prison untill you're a hunter, and even into the 70s.
Once you get dex to 90+ (so that it's an even multiple of 10 with bonus, so for example 92+8 ), then you can put stats into agi, which will make you hit faster.
If you go full dex and doublestrafe everything with silver arrows (which can also be made from the Cyfars that Injustice drop with the skill Arrow Crafting), you should be a hunter in a few hours max, like 3 hours maybe.