As part of a series of questions that I've been doing about microscopic humanoids ...
In my world, there are a race of microscopic humanoid organisms (0.3 mm - 0.33 mm). They live in a variety of biomes, such as leaf litter, stone and on plants and trees. In terms of technological advancement, they are near the bronze age and merely need to find/discover metal. They have domesticated pseudoscorpions, aphids, spider mites and white flies. Being in number 860,000 strong, can mass produce "spider" silk, and have spears (for poking, not throwing), stone "swords". They have silk armor, chariots (sleds) pulled by pseudoscorpions and they can produce vinegar, formaldehyde, atropine and nicotine, although not in extremely great quantities. Most importantly, they can produce and conduct static electricity.
They speak one , homogeneous language , and have a system of writing and number. Their major advancements in technology and information are in Biology, Entomology, Biochemistry, Transportation, Algebra, and Geometry. Due to their worship of their two gods , a god of science and a god of discovery, their scientific progress due to religion ( ironic as that may be ) Is even farther augmented
Their current range is a 500 square foot backyard , including expeditions and colonization of the front yard
What is the fastest was that they might increase their range / spread beyond the back yard?