What modern design can you recommend? Maybe you can share some examples?
You want to create website for client or for you? Here is good guide for design development https://steelkiwi.com/blog/design-development-process-6-steps/ you can use it in your work. Also on this blog you can find many useful articles about design in special category in the right sidebar.
In my opinion, something like WP`s Jevelin looks amazing. You can search it. You can find an experienced UX designer and developer and asked him to create a similar theme.