No, the Oslo Accords did not fix the relationship between Israel and the Palestinians. That relationship is still very far from being fixed in any satisfactory way. The accords did momentarily improve the relationship, but they did not solve all of the problems between the two sides.
One way we can see this is by noting that the Oslo Accords were supposed to lead to the creation of a permanent agreement between Israel and the Palestinians. This agreement has still not come about. There is so-called agreement on the idea that there should be an independent Palestinian state. However, the Israelis and the Palestinians cannot agree on much in the way of details regarding that state.
The Oslo Accords were historic. They marked the first time that Israel and the Palestine Liberation Organization had come to a direct agreement rather than working through intermediaries. This seemed like it would lead to peace between the two sides. However, we can see today that Israel and the Palestinians are still nowhere near to peace.