Python, SQL and knowledge of databases in general. EXCEL < learn how to use it properly. Tableau and Power BI, etc.
I didn't earn a modelling certification. I personally think they are useless. Just work through this textbook: https://www.amazon.com/dp/B08FH8GJJC/
Financial modelling courses/certificates are a waste of money IMO. Just buy this textbook and work through it: https://www.amazon.com/gp/product/B08FH8GJJC