Hard question because activism commonly isn't straightforwardly legal. Legal activism kinda doesn't work because corruption is invested in the status quo and has the power to suppress rogue actors. But there's lots of technology companies you could build that could defeat corruption by making a technology that makes corruption infeasible. It's a circuitous route to activism though, and it doesn't feel as powerful or immediate as traditional activism. And you're likely to be subverted by the corruption, else losing your business or being branded a criminal.
Illegal activism isn't much better though. Snowden & Aaron Swartz were modern activists that told truth to power and got hammered.
There's a reason your country has sustained corruption that has global implications. Do you know what foreign influences the corruption serves? A good way to tell might be finding out what corporations are invested in your countrieseconomy. Then as an activist you can target that corporation in your search to expose the truth of who funds and perpetuates the corruption.