Can you make money on Fiverr without a skill? No. As a freelancer, as with any profession, you need a skill to make money. Even if you list a service only to outsource it (service arbitrage), you will still need project management, management, and organizational skills to complete the gig.
Should you promote your Fiverr profile and services? It depends on your income goals and how much you want to depend on Fiverr. If you join Fiverr to make a full-time income, then you should consider some free or low-cost marketing activities. For example, you could add your Fiverr profile link to your website or LinkedIn profile. If Fiverr isn’t going to be your primary income stream or focus, then don’t worry about marketing your services. Even if you do no marketing, Fiverr spends millions of dollars on advertising to attract new users.