I use Linux and connect to the internet with a modem, but many sites are blocked by the ISP in Indonesia.
How can I open a blocked site? It's not a porn site.
if you can find a proxy server that is not blocked, then you can just proxy. search for something like proxy servers accessible from Indonesia. Or you can consider vpn and search for a similar phrase.
If you have a server in another part of the world, then you can also set up your own proxy.