If you’ve got a bit of spare time on your hands then answering paid surveys online is a great (and rewarding) way to fill it. The surveys are normally fairly short and sweet & you’ll earn money each time you complete one. There are a whole load of different networks such as Global Test Market, Ipsos, Swagbucks & you can sign up to as many as you like.
Google Analytics is free to use, and the insights gleaned from it can help you to drive further traffic to your website. Use tracked links for your marketing campaigns and regularly check your website analytics. This will enable you to identify which strategies and types of content work, which ones need improvement, and which ones you should not waste your time on. 7 Free Traffic Sites to Increase Website Traffic for 2020