Magento2.3 website speed optimization ( only individual)

Hi All,

I need some one good in Magento2.3 speed optimization over remote connection. (i will check if you can fix some, then we can go for big work)

i need fix
- Avoid an excessive DOM size
- Serve static assets with an efficient cache policy

I'm looking after your speed optimization my
- Google Page Speed
- Pingdom Tools: Website Speed Test
- GTmetrix | Website Performance Testing and Monitoring

with regards,