I lost the link to my posts in my menu bar

I’d check/adjust the Menu (under Appearance, Menu; also usually within Appearance, Customize).

Create a menu if not already there. Then add a “Custom Link” to the menu. The URL is your home page, the Link Text is something like “Home”. Drag that menu item to the spot on the menu (the vertical list of all the menu items).

Once you save the Menu, use the “Manage Locations” tab to assign it to the menu area the theme uses.

Add additional menu items as needed.