Most organic way to level a DOL without leves is to use him as a counterpart to a DOH. Some DOH need a lot of items a DOL can gather and this way you level 2 characters and it doesn't feel that odd anymore to do it without leves. Miner is essentially needed for Goldsmith if I recall correctly and maybe other ones as well. Can't remember anymore since I am done with both DOH and DOL since longer time. A quick look in the recipe book of a DOH will reveal who the DOL counterpart is.