Next and Previous loop

Use get_adjacent_post to first see if there’s actually a next post:

if (get_adjacent_post (false, '', false)) {
    next_post_link ('%link', 'Next Project >', true, '', 'projectcategory');
} else {
    // manually create link to first post here
}

This site shows one way of actually getting the first post’s link, such as with a WP_Query call and then calling get_permalink. The exact code depends on the types of post you are showing.

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