The thin-film lithium niobate (TFLN) modulator is among the most critical devices in photonic integrated circuits (PICs), owing to its large modulation bandwidth, low optical loss, and high extinction ratio. However, it suffers from DC drift issues at low frequencies or long timescales. Here, we have successfully alleviated the DC drift effect of the electro-optical phase shifter (EOPS) at low frequencies by employing a high-energy Ar