How to find low hanging fruit keywords

I’ve checked this subreddit for similar questions but didn’t find many. I recently launched a blog covering various topics from blogging tips to recipes. My primary traffic source is Pinterest, and I’ve been optimizing my profile accordingly. While doing so, I’m considering low-volume keywords to target for organic traffic. Could you recommend any free websites for finding such keywords? I’ve tried Ubersuggest but I’m not entirely confident in its accuracy. My domain authority is 8, just to provide context (though I’m aware it’s just a number according to MOZ and Google doesn’t prioritize it). Any suggestions would be appreciated!

This guy gives good tips