\begin{document}$ \text{fb}^{-1} $\end{document} of \begin{document}$ e^+e^- $\end{document} annihilation data collected at center-of-mass energies ranging from 4599.53 MeV to 4698.82 MeV by the BESIII detector at the BEPCII collider, we searched for singly Cabibbo-suppressed hadronic decays \begin{document}$ \Lambda_{c}^{+}\to\Sigma^{0} K^{+}\pi^{0} $\end{document} and \begin{document}$ \Lambda_{c}^{+}\to\Sigma^{0}K^{+} \pi^+ \pi^- $\end{document} with a single-tag method. No significant signals were observed for both decays. The upper limits on the branching fractions at the 90% confidence level were determined to be \begin{document}$ 5.0\times 10^{-4} $\end{document} for \begin{document}$ \Lambda_{c}^{+}\to\Sigma^{0} K^{+}\pi^{0} $\end{document} and \begin{document}$ 6.5\times 10^{-4} $\end{document} for \begin{document}$ \Lambda_c^{+}\to\Sigma^0K^{+}\pi^{+}\pi^{-} $\end{document}."> Search for Cabibbo-suppressed decays <inline-formula><tex-math id="Z-20250514093113">\begin{document}${\boldsymbol\Lambda_{\boldsymbol c}^{\bf +} }$\end{document}</tex-math><alternatives><graphic specific-use="online" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/2f9946ad-b106-406c-b033-65866820dba8/CPC-2025-0119_Z-20250514093113.jpg"/><graphic specific-use="print" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/2f9946ad-b106-406c-b033-65866820dba8/CPC-2025-0119_Z-20250514093113.png"/></alternatives></inline-formula> → Σ<sup>0</sup><i>K</i><sup>+</sup><i>π</i><sup>0</sup> and <inline-formula><tex-math id="Z-20250514104905">\begin{document}$ {\boldsymbol\Lambda_{\boldsymbol c}^{\bf +} }$\end{document}</tex-math><alternatives><graphic specific-use="online" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/2f9946ad-b106-406c-b033-65866820dba8/CPC-2025-0119_Z-20250514104905.jpg"/><graphic specific-use="print" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/2f9946ad-b106-406c-b033-65866820dba8/CPC-2025-0119_Z-20250514104905.png"/></alternatives></inline-formula> → Σ<sup>0</sup><i>K</i><sup>+</sup><i>π</i><sup>+</sup><i>π</i><sup>−</sup> -
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