It's hard to offer advice in situations where little is known about the vehicle.
If you don't like the ride and don't need the extra ride height than consider returning it to a "stock" condition - the challenge is, there are several different ways to lift a vehicle and if you don't know how it was lifted, then you won't know what's required to return it to stock, and you'll need to find someone familiar with the Vitara to examine it and tell you what needs to be done.
The task could be as simple as removing spacers or as complex as having to track down and purchase replacement springs, shocks, control arms, etc.