197 less "rattly"

Not exactly your normal question. My 2006 197, just had the cambelt done - never missed a beat from new and always replaced what was needing upon failure.

Recently the car is starting to feel a little rattly and loose. If I drive with no audio on at all, the amount of little taps, knocks, clunks over potholes is quite annoying. My open question for suggestions and debate is what can be done to make it abit fresher, I am currently thinking about coilovers (H&R) would this replace my 6 year old suspension and possibly make the ride feel firmer and stronger in a sense again? Like do people who have coilovers think the general ride is better?

As far as I am aware I have no suspension faults, recently had MOT and usual service. Was thinking of taking doorcards off and tidying bits up with sound deadening. Just trying to keep on top of it, some days I just wish the build quality was better.

Hoping other people out there feel this and thanks in advance,