Research model

I am doing research on the impact of covid-19 on Pakistan stock exchange. Pakistan stock market index is dependent variable and new covid cases and deaths are independent variable. These are based on daily  I also have other independent variable such as democrats accountability index and investment freedom annual growth in gdp%  uncertainty avoidance and these reading are based on annual. And are not changing  I am having difficulties in choosing econometric model can any one tell which model should i choose