Hello @Aman,
Sorry, but your reply is unclear to me.
About this – https://prnt.sc/xHY6ggdNu5L5, it comes from your changes in the child theme. We are not responsible for custom changes that you do in the child theme.
About your screenshot https://prnt.sc/Meg-hvrGBMPe , Reduce initial server response time– contact your hosting provider, because it is server-side; Eliminate render-blocking resources and Reduce unused CSS – you may try solutions described here https://onlinemediamasters.com/eliminate-render-blocking-resources-wordpress/ ; Reduce unused JavaScript – https://web.dev/unused-javascript/?utm_source=lighthouse&utm_medium=lr (disable unrequired plugins).
Regards