Minimizing effect of bad external fengshui

[myfs_110628]

I stay in a rented flat located in the close vinicity of a hospital and faces a construction site across the road where there are numerous hollow metal beams (of a new building of slightly taller height under construction) pointing towards the main door (bright red in color). Just behind my flat (where my bedroom and living window are), there are two railway tracks (for the tube) and a big dead tree (it is winter) just after one of the tracks outside my bedroom window.

Do I need to use a Bagua mirror at the top of the main door to reflect the Shar Chi (I don't wish any accident to occur on the opposite though) and hang 6 metal coins at the living or bedroom window? Or is there any other better way to minimize the negative effects. Changing flat unfortunately is not an option at all. Please advise. Thank you!