Respected members

Here is the info with respect to my data set N=14 and T=30, so I have a panel data set with strongly balanced. i have dummy variables also in the right hand side.I performed fixed effect model. Next, i examined the assumptions of autocorrelation, using xtserial command and then hetereskedacsticity with the help of xttest3. According to the result model is free from autocorrelation but there is a problem of heteroskedasticity. The R2 is also very low (less than 30%). What is the next step? Guide me in this,