Hello Sir/Ma'am,
I have a total of 6 years of full-time working experience in Magento2, and I mainly work with Magento2 only, so I can help you with any of your tasks related to Magento2 development/customization/migration/bug fixing/theme designing.
And, currently, I am working as a full-time freelancer and looking for more tasks, that's why I can also allocate more time if you require and complete your tasks ASAP.
Regarding your upgrade work, first I will require the details of the Magento to finalize the current data, customizations, and available modules so that I can confirm how much time it will require, and the cost will depend upon that, and the more project which you can offer :)
Thanks & Regards
Ankit Srivastava