My s5470 does not sustain well at all.also,the bridge pickup sounds ok but lacks ''attack'' in upper register.great guitar otherwise.i use a peavy 5150 60watt amp.

Try raising your pickups.a over drive. It might be your amp settings. Modify your guitar to active emg 81/85 pickups. Plus 24 fret guitars don't sustain as well as 22 fret guitars. Your tremelo design might be affecting your sustain also. You may just need a new guitar. Try raising the pickups first then buy a tube screamer or another overdrive behringer makes a od400 for 23 bucks

I personally use Seymour Duncan Humbucker pickups, and have never been disappointed. You might want to take your guitar up to a music shop and try it on different amps to see if your amp is your problem, or if it is your guitar's pickups or wiring. You could also try adjusting the height of the pickups until the sound you are looking for is achieved. I have also had guitar cables make a big difference in the sound. Make sure you have a good set of cables, and you may want to adjust the EQ settings of your amp to make up what the guitar lacks.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514