Can You Help Me With This Challenge? (Finding a LC & HT Keyword)

So I'm being challenged to build an affiliate website that can at least break even in a month or two.

I know a bit of SEO, but I come to the wisest community on the internet regarding this because I know that I do not know enough to do this alone.

If you had to find a low competition and high traffic (& high intent) keyword using free strategies and tools; what would you do?

I know Ahrefs and SEMrush are popular go-tos, but I think the only way I could really use them is if I do a trial...

I've been playing around in google trends & ahrefs free keyword generator, but I don't really know if this is enough to go on to qualify a keyword.

I look forward to all those who are able to help & can provide more info if it is helpful

Cheers!

@paraztos has posted a nice tutorial on how to find good keywords for free. Check it out:
https://www.blackhatworld.com/seo/how-to-do-keyword-research-for-free.1380646/