I am in a similar situation. I work for a small agency and am a content manager and -strategist but that means I do all the writing (with some help from freelancers).

ad copy, email copy, eBook copy, blogs + SEO, newsletter content, social media scheduling

It’s a great way to get a lot of experiences but I don’t think it is sustainable long term. I don’t think it is uncommon – but just depends if you enjoy it.