Based on the project requirements you've specified, I believe the work is not a one time exercise, it's an on going job. I have vast experience working on the tools you've specified, to start with the given tools give us enough data to take conclusive decisions. I'll set up conversion funnels, custom attribution models, page speed insights reports and many more.
It's equally important to closely monitor your marketing campaigns performance, I'll help you set up tracking of these campaigns.
Also, I'd like to know how you deploy each of the tags(Google Analytics, Google Optimize, hotjar etc) on the website, if you're using a Tag management system, it'd be great so that it becomes easy to add any additional tracking if need be with out having any dependency on the developers.
A small brief about me, I'm a certified Google Analytics, Google Ads, GTM, professional, I've been working on enterprise level products like Optimize 360, Google Analytics 360, Hotjar, DV 360 for more than 5 years now. Please drop a message and we could discuss this further.