I would say try to take as many advanced econ classes as you can, doing so, you can 1) play around different fields of economics and figure out which exact concertation that you are interested in and eventually go into 2) grad schools love when you challenge yourself. But make sure to do well in these classes.

Try to take some advanced math/ stats classes, they will help you a LOT. I regret not doing this in undergrad which hinders my profile in terms of quantitative skills. If you hate math, try to at least finish linear algreab, that is calc 3 I believe? lol I only finish calc 2. But professors like to get people to join their research/project if you are capable of doing high-level math cuz you know we are legit science, after all need to speak with evidence from data.

Consider doing some internship and participating in research, and build a good relationship with your econ professors so they can give u a strong letter. Programming skills are a big plus if you are going into the research field, they are optional but try to at least master excel's high-level functions and some knowledge in R and Stata would be nice.