Revamp Crashed WordPress Site

My WordPress site went down suddenly and, rather than simply patch it, I want to bring it back with a clean, modern look. The content and basic structure can stay, but everything visual needs a refresh.

Here’s what I need from you:
• Assess the current (crashed) WordPress instance, back it up, and restore functionality.
• Recommend two-to-three reputable, well-supported themes that match a professional, contemporary style and can be customised easily.
• Once I choose a theme, install it, migrate all existing pages, posts, menus and media, and make sure everything looks consistent on desktop and mobile.
• Optimise page speed, configure basic security and caching plugins, and hand over clear instructions so I can manage routine updates myself.

No custom functionality is required right now—this engagement is design-focused—so your proposal should centre on theme selection, implementation and visual polish. If you’ve handled similar WordPress recoveries and redesigns, please share a link or two.