Linear Regression models

Hello guys. I am trying to build a linear regression application that is taking 20 inputs and gives 4 outputs. I tested with different custom models and none seem to be able to fit the data. Can you guys recomend a model that is able to fit/overfit most linear regression problems (like boston pricing)? I can’t get other data because that’s all I have and I have around 60k samples (so my data is big enought).