| Astraea Valantor |
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I'm currently playing a low level Arcanist in a Reign of Winter game, so I can definitely empathize with the OP.
However, I haven't really felt useless when out of spells and I think it comes down to the basic principle I employ when playing as an arcane caster, which is to cast spells that will best help my party over the challenge.
Firstly, not every low level encounter needs you to cast a spell. Why waste a spell if the party are easily beating the encounter and taking minimal damage? So conserve those spells so that they are available to make hard encounters easier.
Secondly, have some ranged options. Cantrips such as Acid Splash are great (it also stops troll regeneration) and a light crossbow as back up. Don't forget alchemical items, especially if you've picked up some as loot. A well aimed tanglefoot bag can help your melee crew, and it can even bring down flying creatures.
Hang in there, it gets better!