Hey,
I think you've made a positive step by taking an excel & SQL course, they are certainly some of the core tools for an analyst role.
I think given the breadth of free educational content online that you don't need to go back to school if you don't want to.
Perhaps check out https://www.coursera.org, it has some courses backed by top universities and/or tech firms such like IBM & Google - (This one may be of interest). I believe you can complete the course content for free, but then you can pay to receive a certificate at the end if you'd like.
If I could add some traits and additional tools that would be worth, in my view checking out (most of which are covered in the course linked above) which will stand you in good stead for taking a data role I'd say;
- SQL (get familiar with the basics; join types, data types, window functions, group by etc.)
- A data visualisation Tool (Tableau, Power BI etc.)
- Related to the above - how to find meaning from data & to make it easy to interpret - be familiar with identifying trends in data.
- Some basic Python and/or R will be useful, these tools will help you identify those trends mentioned above (and a whole lot more)
- Some foundational statistics knowledge will be useful.
It's quite a broad field so I'm probably missing a lot here. and as a final disclaimer, I've not taken a Coursera course myself, but, I've always thought that they looked quite comprehensive.
Good luck!