Brian Tomasik wrote this article on his donation recommendations, which may provide you with some useful insight. His top donation recommendations are the Center on Long-Term Risk and the Center for Reducing Suffering. CLR and CRS are doing research on cause prioritization and reducing S-risks, i.e. risks of astronomical suffering. S-risks are a neglected priority, so any additional funding for S-risk research will likely have more marginal impact compared to other causes.
Brian Tomasik wrote this article on his donation recommendations, which may provide you with some useful insight. His top donation recommendations are the Center on Long-Term Risk and the Center for Reducing Suffering. CLR and CRS are doing research on cause prioritization and reducing S-risks, i.e. risks of astronomical suffering. S-risks are a neglected priority, so any additional funding for S-risk research will likely have more marginal impact compared to other causes.