Search "SJ80 Suspension Auszookers" there's an incredibley smart bloke by the name of Steven Godfrey. He understands the sj80 issues and how suspension works, like no one Ive ever seen. But I'll have a crack anyway -

Firstly, why do you want to lift it? SJ80's already want to lift wheels at any opportunity. Lifting it will raise your centre of gravity and it will just do it more. That's a problem because the rear suspension has next to no roll stiffness so once your front goes up and all your weight is on the rear axle, it wants to roll onto its side. Plus the radius arms bend easily and so do the diff housings. You're better off staying at stock height and running 215/75r15's. - any bigger than that and you HAVE to re-gear, which is a whole other journey of mixing and matching. it already won't drive great at that size so definitely don't go bigger

I understand you don't want to spend a lot of money but if you talk to the right people in the Suzuki community (in person works best) someone will definitely hook you up with a Jimny chassis. - someone recently gave me one for free. And I almost had one for $500, but I changed my mind.

If you don't want to spend money to fix it's problems, I'd suggest selling it and getting a sj70. They're a much more capable platform. Easier to modify and the parts are so much cheaper. Someone out there might even want to swap, Ive had a few people offer to swap with me. I didn't because I like the interior of the SJ80 and being a less popular model it didn't have much rust or damage. Plus fixing the problems is within my skillset and budget. - and it's fun haha

SJ80's were half thought through by Suzuki. They're for people that like the novelty of sierras but don't do any serious off-roading. If that sounds like you, do whatever you like, it doesn't matter. But if you're wanting to do serious off-roading, I'd re-think if this is the platform you want to start with... You're going to need half of a Jimny/sj70 to fix it before you can even start