Area-51m R1, how to reset?

Hi, 

I bought an alienware area 51M R1 in Jan 2020. It was with one of my cousins so far. I got it back recently and would like to reset it to factory defaults. 
I wish to keep all dell softwares intact along with anything that came with it. I will delete all useless apps later on. 
the only option I know of to reset system is though windows 10 reset. 
do we have any other way to achieve the same? 

Thanks