I know this may fall under "opinion," but I'm also genuinely looking for advice on how to proceed here.

Our product owner recently left our team of 3 developers for another role. We don't work on a single product, but do lots of projects and support multiple applications for other business units.

I was previously a lead developer as well as the Scrum Master, and now that our PO left, that's now my role too. I'm just wondering if this sounds like a setup for failure to anyone, or if there's a way to make it work productively, what are some things I can do (or watch out for) to be as effective as possible in this triple role?