Hunt for under-priced used books that you can sell online. Download an app that reads ISBN numbers so you can scan the barcodes on books. This will pull up the book’s current price on Amazon so you can see if it’s worth trying to resell it. Then, visit used book stores, thrift stores, and garage sales to look for high value books. Post the books for sale online using sites like Amazon or Ebay.
For anyone who has capped at their current job, it could be time to look for another. If your salary is capped, it typically means that you are an expert for your current job, and the company can’t pay you anymore money for doing the same job. Take this as a sign to better utilize your skills at a more challenging, and subsequently higher paying job.