Hello Sir,
We have 9 years experience designer and developers who can complete your task in time with great quality.
we are new on freelancer but we have already completed several projects on Magento, WooCommerce, Shopify etc.
You want to upgrade magneto 1.9.1 to 2.3.0. To upgrade magneto 1 to 2 it needs website rebuilt. Magneto 1.9.1 can be upgraded till 1.9.5.
Please let me know if you are interested. We can discuss further details on chat.
Thank you.