why my rear end is sitting low and i feel every bump now on 1998 Cadillac Seville STS

just happen very bouncy ride now

Asked by for the 1998 Cadillac Seville STS
Better have the rear suspension checked. This is electronically adjustable so it can be complicated and needs special equipment to diagnose. Better take this to a shop with the appropriate tools to address this: Here are some near you: