Stolen from the relevant CFAR worksheet: avoid environments or experiences that limit your ability to feel curious (for me these include time limits, extreme temperatures, and bad smells). Think back to a specific and recent time when you felt curious, try to remember what it felt like, and focus on that feeling. Think of a person (possibly fictional) who is frequently or intensely curious (for me this is MoR!Harry) and pretend to be them. Think about the kind of problems that you feel curious about and try to make the problem you're working on feel more like those problems (e.g. by identifying some conceptual feature they have in common).