Wordpress website needs to be updated to a responsive site plus some technical tweaks

General information for the website: Pet care website in the southeast
Kind of development: Customization of existing website
Description of every page/module: We have a 5 year old wordpress brochure website with good rankings for our petcare business but it is currently not mobile responsive.

We need to turn this into a responsive website but hopefully without a complete revamp as we want to keep the content which gives us our ranking. The basis of the website is 15 years old, as such we are very established.

If you can help us changing the template layout in a relatively painless way, please do get in touch. There will be further changes in the future but this is the essential piece of work that needs doing asap.

We also need some ad hoc amendments eg we currently have a contact us form that isn’t working. Looking for an ongoing relationship with a wordpress expert.
Description of requirements/features: contact form fixed.
web based site to be changed to a responsive site.
Extra services needed: Customization
Extra notes: