If you're looking for ideas to get your creative juices flowing, Deblank is a good place to start. It's got AI-powered design tools to suggest color palette and font pairing combinations, and you can save the results for later. That can be a good way to get a design project off the ground and over the hump of initial creative blocks. It can also help you improve the quality of your designs.
Another option is Khroma, an AI-powered color tool that will generate palettes based on your input. It uses a neural network algorithm to come up with color combinations tailored to your preferences, and you can filter by hue, tint and value to narrow down the results and explore the palettes you like.
If you want to get more research-oriented recommendations, Perception has a service that will generate palettes on the fly. Its palette analysis and inspiration tools let you dig into the results to see what's working and what isn't, and you can use it to make more informed color choices that are more likely to be impactful and resonant. It also has a free Perception Lite plan for basic palette generation and analysis.