The paper presents a new perturbative full-shape analysis of BOSS galaxy clustering data, combining the galaxy power spectrum and bispectrum multipoles, baryon acoustic oscillations, and cross-correlations with cosmic microwave background (CMB) lensing from *Planck*. The analysis is performed under the $\Lambda$CDM model, constraining parameters such as the matter density fraction $\Omega_m$, the Hubble constant $H_0$, and the mass fluctuation amplitude $\sigma_8$. The results show that cosmic structure at low redshifts is suppressed by $\sim 10\%$ compared to the *Planck* $\Lambda$CDM model, with a significance of $4.5\sigma$. The authors explore whether this tension can be explained by the recent DESI preference for dynamical dark energy (DDE), finding no evidence for DDE when combining BOSS data with DESI BAO and PantheonPlus supernovae. The findings suggest that either the data contains residual systematics or more model-building efforts are needed to restore cosmological concordance. The analysis also highlights the importance of future galaxy surveys, such as DESI, in resolving the $\sigma_8$ tension and understanding the expansion history of the universe.The paper presents a new perturbative full-shape analysis of BOSS galaxy clustering data, combining the galaxy power spectrum and bispectrum multipoles, baryon acoustic oscillations, and cross-correlations with cosmic microwave background (CMB) lensing from *Planck*. The analysis is performed under the $\Lambda$CDM model, constraining parameters such as the matter density fraction $\Omega_m$, the Hubble constant $H_0$, and the mass fluctuation amplitude $\sigma_8$. The results show that cosmic structure at low redshifts is suppressed by $\sim 10\%$ compared to the *Planck* $\Lambda$CDM model, with a significance of $4.5\sigma$. The authors explore whether this tension can be explained by the recent DESI preference for dynamical dark energy (DDE), finding no evidence for DDE when combining BOSS data with DESI BAO and PantheonPlus supernovae. The findings suggest that either the data contains residual systematics or more model-building efforts are needed to restore cosmological concordance. The analysis also highlights the importance of future galaxy surveys, such as DESI, in resolving the $\sigma_8$ tension and understanding the expansion history of the universe.