Easiest way to raise alchemy?

Fusion is still your best bet. It costs 3 fatigue and gives 60 exp minus a few for each alchemy level over 1. An appropriately leveled potion crafting gives 60 exp for 3 fatigue, which is a better exp/fatigue ratio after level 1 but immensely more burdensome. People spamming up blacksmith or jeweler at least had the benefit of stockpiled ores, however alchemists have to gather all the materials themselves - making the actual fatigue cost much higher if you do it on your alchemist. Even if you do it on many separate herb gathering mules, it's still really time consuming.

Just try to find an equip for fusion that you can buy from an npc that either you want for yourself once it achieves some particular potential, or that you could sell for money. At least that gives you something to work toward besides level 10 alchemy.