Renaissance could actually make it a bit easier to at least demonstrate you have knowledge they don't, as long as you don't pop up too early. If you show up after New World crops have already started popping up in Europe, yoe could demonstrate how tomatoes are safe to eat, provided you don't serve them on dishes or with utensils that they could leach toxins out of.

It also helps mitigate the language barrier if you already speak a modern form of a Romance language and managed to get dropped in a territory where its predecessors were spoken.

Of course, if you go further back in time, I think both aspects get increasingly difficult. Unless this is the first isekai story with a middle aged German academic as the protagonist, I doubt anyone would be remotely prepared to communicate if they got sent back to Anatolia and had to speak Hittite, or something. Then, the pool of candidates with a solid background in the appropriate dead languages gets reduced even further when you filter out those who also lack the technical expertise to be able to explain how to recreate some part of modern technology from scratch, including all the necessary backgrounds processes needed to have the basic technical foundation necessary to be able to implement the thing you know.

If I find myself in that sort of situation, I know I'd be explaining electricity or something and get asked, "How do you get the electricity to start with?". And I would either have to say "Go kidnap some lightning," or "You pay the power company and then flip the light switch." Neither of which are very helpful.

I figure my best bet is somehow getting to the New World first, and bringing back the necessary ingredients so I can invent tacos and burritos, revolutionizing cuisine with a sudden surge of Mexican food options in China or something during ancient history.