Re-build Woocommerce website using GeneratePress or Hello theme

My website is facing a lot of performance issues and others. The thing is that the website was built for an initial project, by a amateur developer (me :D) with poor resources: nulled plugins and chea My website is facing a lot of performance issues and others. The thing is that the website was built for an initial project, by a amateur developer (me :D) with poor resources: nulled plugins and cheap freelancers customizations, and now the traffic is increasing, the issues are appearing.So it is not just a theme change, I nee...