The best way to safeguard Taiwan as the beacon of freedom and democracy it is, and in particular Chinese freedom and democracy, is to not take provocative and counterproductive actions that embolden Taiwan separatists and make the mainland feel that the island is being pulled away from reunification and towards independence by the U.S.. This ill-advised Pelosi visit does nothing for peace, stability, or freedom in the region. It only puts Taiwan at greater risk of invasion and forced reunification while increasing the chances of miscalculations and misunderstandings between the U.S. and China.
The leaders of China understand the difficulty and costs of invading a heavily armed island of nearly 24 million people and will be less likely to do so if that island shows no signs of moving towards independence or unilaterally changing the status quo. This is the best chance that Taiwan has at existing in its current state for as long as possible into the future and until both sides decide to reunify by peaceful means in a mutually beneficial way. I hope at that time the mainland will socially and politically look a lot more like Taiwan than it does now and until then it still has a lot to learn from free and democratic Taiwan.