Exist any blockchain technology that fight against block rewards and prevent the devaluation problems while at same time don't relax the blockchain decentralization and security?
No. The market always boils down to supply and demand, so unless a crypto manages to implement a system that can properly regulate its supply based on the current demand (and that might even be impossible), market mechanics will dictate prices.
The closest thing to what you're describing are probably stablecoins though. Some are pegged to some currencies, while others try to implement clever workarounds. Try reading up on those.