Just to provide some balance - and to stir up the discussion a bit
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- I think you can try to write a modern sounding hit (if that is what you want to do) and your natural style will still show through
I don't mean to self promote but I would suggest listening the episodes 2 and 3 of the SongwriterSelect podcasts:
http://songwriterselect.com/ Here we take a look at 2 "retro" sounding songs ("Uptown Funk" and "All About That Bass") and discuss how they feel both retro and modern
IMHO for a song to sound "modern" and commercial it is really important that it:
Uses a modern sounding vocal - nothing dates a song more than a retro sounding vocal
Uses modern "sounds" - I would really suggest investing in a modern sample library to give you all the swooshes, risers etc. which are key to achieving a modern sound
Uses a really tight "arrangement" - usually:
Verse - Pre Chorus - Chorus - Verse - Pre Chorus - Chorus - Bridge - Chorus - Chorus - Chorus etc.
If you follow this structure you won't go too far wrong and the song will "sound right" to most people
Drums - you also need modern drum sounds - I personally like building my basic pattern from scratch and then embellish it with some loops that you can add in and take away
Dynamics - part of the modern sound is to have your song generally "build" but also include some noticeable "drops" and "impact moments"
Eg. Verse 1 might be drums, bass and vocal, the pre-chorus might introduce keyboards and a percussion loops, the chorus then includes a big synth pad and more percussion, verse 2 now drops to include drums, bass, vocal and the extra percussion loop now stays etc. etc.
I would suggest picking your favourite "modern" song and we can take a look with you to show you what it is doing and how it works - you can then emulate these "tricks" without copying the song