Improvements to existing site on wordpress

I am looking for a person who can help improve the site. It was created quite a long time ago, but recently there were attempts to change the color scheme, unfortunately by an unfamiliar person and the result is inconsistent. In detail, it is about the following corrections:

- improving the color scheme of the menu

- improving the display of the "calendar" on the home page, so that upcoming events also appear. Events are added to the page like "posts", they are filtered by date and only past ones are displayed in the calendar; and we want upcoming ones as well.

- music inserted under "Listen" should be limited to a few tiles, instead of all possible tiles.

In the English version of the site:

- home page configuration identical to the Polish version -> now nothing is displayed, neither the calendar nor the music to listen to, and the menu is not connected properly

- the colors of the English version are completely mixed up

The site has no store or other add-ons, it is meant to be a fairly simple business card. There are a few pages full of text that can stay as they are.

I am open to ideas to visually enhance the site.

The template is based on files with rss, js, html and php extensions, I expect to be proficient in dealing with such. Please let me know how the job could be priced and what would be a possible completion date.