LF Purifier build advice after 3yr break

Hello, I found my old saves from 3 years ago and decided I would like to get back to the game - sadly, I don’t remember shit and don’t know where to begin now. I know I had troubles pushing finals levels of crucible with this character and I’d like to finish this build at last. Could you give me some tips what should I farm next and where?

Maybe these builds could be useful to you https://www.youtube.com/results?search_query=dagallon&sp=CAI%3D
(3 most recent Dagallon builds made by banana_peel, mad_lee and grey_maybe) also another similar build by Nery here GD Purifier pure fire DW pistols 151-170 - YouTube

Thanks, I’ll check that!