(Wake up where? You mention the grandfather paradox but 1718 is precisely 70 years before my country is invaded/colonized by the British. My very presence, as a 'European' on the continent of Australia would tear a rip in the fabric of space-time.)
So presumably I'm back in my ancestral homelands of Britain and Ireland.
But language is an issue.
(revival efforts aside) Norn, Cornish and Manx are several of the languages of the Crown that have gone extinct since 1718. I would catalogue these endangered languages and stress the importance of preservation and multilingual education - which is a theme in 21st C society in the case of Welsh, Basque, Catalan etc.
And the 18th century brought education to deaf children into modernity. The interventionist in me would unify fledgling British, French and Martha's Vineyard efforts into a common variety so that the world's hearing impaired can communicate in the same language.