Does the content on niche like festivals, wishes or quotes be considered as duplicate content?

Recently, I have started a Festival Wishes based blog as a starting step to drive traffic to something in future. I have some SEO experience (5 years back) but this niche is new for me.

It’s not easy to create unique content in this niche and overall the meaning will be similar. So what should be the right way to avoid duplicate content (not referring to plagiarism, it is avoided) and slowly set up the right SEO strategy for this niche. I am having hard time even to get the articles indexed in 48 hours, blog is 90 days old. I am using WordPress as CMS.