wordpress speed optimisation desktop/mobile

Hi,

1. I need wordpress page speed optimisation desktop/mobile
2. plugins update without errors
3. litespeed cache plugin optimal setup
4. mobile error crash elimination (probably litespeed connected)

website: svetslik.si
purchased theme with backery + wc
litespeed cache installed
clouflare
hosting speed should be OK

thank you for offer and explanation what result can I expect.