Wordpress Website Speed Optimisation

We are looking for a developer to speed up our website www.the-oomph.com by a measurable amount.

We would like to use the following Google software to test the site and also to measure the improvements in speed we require. The figures below reflect what we currently have and we need a significant improvement from our chosen developer.

https://testmysite.thinkwithgoogle.com/

Loading time
29s on 3g ------------ (we want this halved at least) ------------

38% Est Visitor loss ------------ (we want this halved at least) ------------

https://developers.google.com/speed/pagespeed/insights/

Mobile Page Speed
Average ------------ (we want this to be fast) ------------

Optimisation
Low ------------ (we want this to be medium/high) ------------

Desktop Page Speed
Slow ------------ (we want this to be fast) ------------

Optimisation
Low ------------ (we want this to be medium/high) ------------

If you can get our website into the 'fast' page speed with a medium/high optimisation we would like to hear from you. If you can get back to me with your predictions of speed improvements and also how long the job would take I would be happy to consider you for the work.

Thank you in advance and I look forward to hearing from you.