I hope you are well today and thank you for your question.
The first thing you can do to optimise your site is to use this cache plugin https://wordpress.org/plugins/w3-total-cache/ and configure it.
Also please refer the information provided on the following pages to optimise your site.
https://codex.wordpress.org/WordPress_Optimization
https://techtage.com/speeding-up-wordpress-sites/
https://gtmetrix.com/wordpress-optimization-guide.html
Best regards,
Shufflehound team