I recently started working as an admin/accounts assistant at a newly established accounting firm. However, over time, the company decided to hire several bookkeepers and asked me to take over the day-to-day operations of the office, as I have been here since the company's inception and have a deep understanding of its mission.

Currently, my job responsibilities include market research, website and marketing material design, administrative tasks, as well as basic bookkeeping and accounting for the company.

My only question is: when filling out online forms and email signatures, I am unsure what job title I should use.

Any suggestions are welcome, thank you.