Original suspension worn out, how to tell?

[GM man]

I've posted several times about how crappy my Jimmy rides, looking for some miracle cures and to this point the consensus has been to put softer leaf springs on it but that would require at least a 4" lift on it and it would ride like a Cadillac. I've also been told I could accomplish the same thing but only do a 2" lift from rough country. But I really don't want to put a lift on my truck and now I've had a fella ask me if I just replaced my leaf springs if that would correct the way my rig rides. Well, I've never really thought about that for some reason, but it makes sense, especially since many of ya'll have told me that ya'lls truck rides good with your factory set up. I just need to know, before I order new springs using the factory height if there is a way to tell if my springs are just worn out and if replacing my factory stuff with new springs, etc.. would improve the way my truck rides. Any suggestions or recommendations are welcome.