What would most likely increase the rate of speciation in this population?

The rate of speciation in a population is likely to increase with factors such as geographic isolation, which can prevent gene flow between groups, allowing them to diverge genetically. Additionally, environmental changes that create new ecological niches can drive adaptive radiation, leading to the emergence of new species. Increased mutation rates and varying selective pressures, such as changes in predators, availability of resources, or climate, can also contribute to faster speciation.