You have to look a this thing statistically. Statistically, 30% have always voted against the PAP. Some elections, it rises to 40%. But they never win because the rest vote for the PAP. That means that if you look around you. Whether in your office among colleagues, whether in uni among fellow students, whether in a factory among workers, you will see that statistically 7 out of 10 people will vote for the PAP. If you are one of the 30%, make it your mission to convince just one person who is a PAP supporter to go over to the oppo side. It does not matter which oppo party they vote, as long as their vote gets changed from the PAP to an oppo party. If everyone of the 30% convinces just one other voter NOT to vote PAP anymore, then they will have double the count to 60% votes and the PAP will have the other 40%.
Is this enough to win the election for the oppo. Probably not, not even with 60% of the vote. The reason is that the oppo is fragmented, and all the oppo votes will not go to one oppo party. However, when the PAP sees they have less then 50% of the popular vote, I guarantee you 100% that they will shit in their pants. Plus they would have lost high paying MP seats to other parties and it will hurt them financially and in their ability to place balls licking cronies into the PArliament. This is enough to force them to make changes. They cannot afford not to accommodote the population request for less FTs, lower cost of housing, health care, etc. It could force them to release CPF earlier or it could force them to reduce NS length, etc. We don't know what will happen, but something will happen for sure.