Top: Long-term light curve of EI Psc composed of ASAS-SN, ZTF, Gaia, AAVSO, TESS, SPM, Ondřejov observations, and observations published by Skillman et al. (2002). The vertical lines represent the date of spectral observations of LAMOST (brown), ESO (green), and GTC (yellow). The black and red triangles mark the observed outbursts and superoutbursts, respectively. Bottom: Light curve showing the scheduling of different observations focusing on the time of GTC observations (yellow vertical lines) and SPM observations. The photometric data in both panels were shifted in such a way that the quiescence level would be the same as for the SPM data.