Light curves and hardness ratio of 2021 (top panel) and 2022 (bottom panel) outbursts. In the top of each panel, we show the light curves in the 0.5–10 keV and 2.0–20.0 keV bands from NICER and MAXI observations, respectively. In the bottom, we show the NICER hardness ratio between 3.8–6.8 keV and 2.0–3.8 keV. Each black point means 64 s data of NICER and all bursts have been removed. The blue points represent the MAXI data. We marked the onset of all bursts observed by NICER and Insight-HXMT as black and red bars, respectively.