See tabs within the document for location-specific grants with topics related to the fields that use APA style. Most of the grants are not specifically intended for research, but with an action-research project, you could partner with a government organization or non-profit to receive grant funding. You may need to write the grant or hire a grant writer if they don't have the personnel to take on that challenge, but they may be willing to pay you as a consultant. A program evaluation could be a valuable service to offer a non-profit. Universities or schools can receive grants too, but be aware that there is typically a lot of paperwork involved.
If you haven't yet decided on a topic, consider working on a direct social benefit topic such as the following. I offer a need-based and topic-based scholarship of half off the standard pricing for those choosing a project that furthers environmental or social causes including the following. I would be available for a no-cost consultation to discuss how these topics might be researched in a way that fits your interests and capacities.