Putting it all together
By now you should have a pretty lengthy list of products that could genuinely help your audience. Hopefully that spreadsheet muscle is getting a workout right now.
These exercises are not just limited to helping you find relevant Amazon products, they are also useful to help you identify needs that are not addressed well by existing products, or potentially needs where there are no products at all!
If you do identify any needs like this, you might consider making your own product that better addresses the need. Needless to say that this is its own can of worms, so check out the supplementary resources page for further reading.