There are few ways. One is kidnapping some Syrians which is not the best way
The best way is for our government to go to Syria and try to make some deals regarding the Lebanese prisoners and change some of the Lebanese-Syrian agreements which gives benefit to Syria.
On the table
[coz under the table it might be different], USA is pressuring Syria so it's the best thing to do for our government is going to Syria and using the pressure for this issue.
Moreover, every political party must unite with the FPM and organize protests infront of the UN headquarter (or whatever they call it) in Beirut. This might put a little more pressure on Syria.