Template for my website

Hi! Now I am trying to choose another template for my website https://menacetopests.com/.
I like this one https://themeforest.net/item/freebuild-construction-html-template/24466140?_ga=2.27412028.1683623624.1608481202-1443511348.1608481202
The thing is I want to customize an animation using it. Is it possible to add my own JavaScript plugin or there is another way to customize it?

Well the immediate problem I can see is that you are currently using Wordpress CMS on your current website, and the the template you like is only an HTML template, therefore not a wordpress theme.