Build an impenetrable DMZ, keep improving missile defence systems, continue forming alliances with neighboring Arab states, stop settlement expansion in West bank, crack down on settler violence, expel right-wing zealots from positions of power, iterate for 20-60 years, let the next generation figure it out. Get hostages out as a condition of a ceasefire agreement.
Things were looking optimistic during the Oslo talks, I don't see a reason why we can't get back to that state of affairs with enough steady work over a 30-year timeframe.
The alternative, an invasion, is also a multi-decade investment, by the way. You can't just remove Hamas and not occupy for decades if you don't want another Hamas to emerge.