DPO requirement for online company who has 1 employee

Can I myself be a DPO for my own online multivendor marketplace? I am in progress of creating a membership-based online multivendor marketplace for digital products. The purpose of this business module is not to have employees and give the option to earn for others and I would be the only person working and operating the website. I would be keeping the costumes/members data to a minimum, however, IP address and customer purchases are still necessary to keep for business analytics and accountancy purposes. My website is able to offer costumers to remove/rectify their data by themselves independently as well as to contact the DPO (which would be me). I see me the most suitable person to do the task as I am the one who created the site, will be doing the future development of the site, a provider of security applications/doing the weekly scanning and backups. I can't find on the internet clear sentence which would agree with mycase, therefore I wish you could give me an advice. Also, I am wondering if there is some kind of insurance/auditor s, what would assure/ensure I am safe to make the site Live - to the moment it is almost ready- I am just afraid that there may be some small aspect/point what somebody could pick on. I am just at startup position and wouldn't be able to afford an independent DPO. please advise.