Maybe you could get the customers you have on Fiverr over to your own website where you can sell them even more products/services.
Whenever I am on a platform (ebay, instagram, fiverr, etc), I create a website and send customers over there so I can sell them the same items at better prices than I offer on the platform. That gives them an incentive to buy from my website instead of the platform. This is how I scale a platform/website.
I also post items on my website that I did not put on the platform. That way when they get to my site, there are new things to look at and I have those items priced high. This is how I scale my income.