ゆっくりと
ゆっくりと · yukkurito · JLPT N5 · noun
slowly
🐢 yukkuri = unhurried + to (adverb marker): do it in a yukkuri way
ゆっくり is a mimetic word for an unhurried, relaxed pace; the small っ makes you pause mid-word, so the word itself slows down. The と particle turns it into an adverb. ゆっくりしてね means take it easy.