Olivia,
That's a pretty common issue. what's your niche? I have a pretty common one too, affiliate marketing. So what I do is google what holidays and official months are coming up and use that as a starting point. for example, May is national mental health month so I write about how to deal with stress in the workplace and if you want to lower your stress and work from home, try affiliate marketing. here is a good website for the months of the year https://www.beckershospitalreview.com/quality/healthcare-awareness-calendar-key-months-weeks-and-days-from-january-to-december.html