Welcome to the Q&A Forum

I agree with Effectdigital - best method is to go to the Acquisition section and look at the data by source and medium - as well as confirming whether you are getting organic traffic, it means you can confirm where you are getting traffic from if it isn't from Google. In terms of your keywords question I couldn't say for certain why those tools aren't returning keywords but what do you see if you load your site with JavaScript switched off? Sometimes using JavaScript reliant sites can mean that tools like the ones you describe can't quickly pull content to get suggestions. Couple that with not ranking for terms that these tools may have already picked up and that could lead to what you're seeing. For what it's worth if that is the cause I'd consider server side rendering - the easier you can make it for machines to read your content, the better. Hope that helps.