Customization to existing React website. — 2

We have a basic react website ready (15-20 Pages). There are a few changes that need to be done there.
1.) Make the website responsive.
2.) Add some features to it as requested by the client.
3.) Maybe we need to get up to 5 pages developed.
4.) Connect the backend API (To be discussed later).
5.) Customize the design a little bit as requested.

More projects will be coming in the future. So quote your price accordingly.
**Lowest price and New freelancer will be given preference.