If the Amazon is anything like South Florida, you could literally bulldoze it down to bare earth, and within 20 years it'll look like primordial jungle again.
My parents live in Naples, Florida. At some point, my dad got old & stopped trying to maintain a 10x10 foot corner of their back yard, and allowed it to revert to South Florida jungle for almost 12 years. This is an area that was literal *grass* when I was in school. When I took it upon myself to clear it for them, it took 3 weekends with a chainsaw, wood chipper, twice-emptied DUMPSTER, and a day with a rented backhoe to transform it back into "grassy yard". It had trees with trunks literally fused into each other & growing SO TIGHTLY TOGETHER , I would have probably died from impalement if I'd lost my balance and fallen backwards or sideways onto the stumps of trees cut down earlier while cutting my way back into the area with the chainsaw.
Have you ever wondered what GRASS looks like when it's left to go completely wild in Florida? Basically, it turns into an alien-looking plant that's neither bush nor tree, but just kind of has this tightly-bound shaft that's about 3 feet tall that erupts at the top into HUGE blades of grass taller than you are.
My parents had an area along the side of their yard that was originally 3 feet deep where they had some plant that's kind of purple and fleshy. By the time I went to go beat it back into submission, its offspring had sprawled a good 12 feet from the property line and practically overgrown the brick path around the outside perimeter of their pool cage. And THAT was the result of MAYBE 2-3 years of yard-neglect.
It's absolutely UNREAL how quickly plants in South Florida go wild and overgrow everything within a few feet. In less than 3 years, something can go from "weed" to "tree with trunk and roots thick & extensive enough to need a chainsaw & backhoe to remove"