Best ways to speed up Shopify stores

I know Shopify is either loved or hated, and when it comes to total customisation and things like site speed ups they dont compare to Wordpress etc, but for the people out there who use Shopify or are new to eCommerce, what are the best ways to speed a Shopify site up?

I use gtmetrix as its a good solid tool and i find better than Google's page speed insights ( yes i appreciate they use lighthouse now too ). But surely Google will rank you off it's own page speed insights scores ( which dont do well with Shopify )?

So what can we do to Shopify stores to speed them up? Things like javascript render blocking etc are not easy so how to fix that and any other good tips etc?