For optimize already minify CSS, js. Merged CSS and js. But still not achieve as much exact results.
Gtmatrix always display F scored.
How to optimize the code and increased site load time?
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Dont Merge JS this is no more recommended. With Http2 the benefits of merge do not compensate for the increase in JS payload due to merge JS.
Magepack might also be worth checking out, depending on your theme it may or may not help. We had mixed results in the past: https://github.com/magesuite/magepack
If you can, rebuild your theme on top of Hyvä, this should give you the best results as it focuses fully on building fast frontends with state of the art technology: https://hyva.io/hyva-themes-license.html