It's best to keep doing anemos till 21 i think, the fate train. Then at 21, start soloing or partying to do your logs till 24ish. At 24, you can do logs or exp on mobs that spawn fates, and join fates that spawn in the lower half as they pop. it's longer, but i more or less soloed to 29 doing that. Logs only require mobs up to less than 2 level below you, or even matches for sprites and ashkin. If you buy a stack of anemos potions, you can solo them if you set magia to 3/2 or 2/3 depending on your tolerance for damage. Tanks can go 4/1.
