time series statistical analysis to find bidirectional relationship between public debt and growth(gdp) -- 2

I need help with analyzing the bidirectional relationship between public debt and growth(gdp) using VECM, granger causality, johansen cointegration, unit root tests, to reach a conclusion if the debt causes gdp growth and if growth causes increase in debt in the long and short run. I am looking for someone who is expert in time series analysis using econometric programs