Am not a fan of all these exchanger like changelly, that's my choice and am entitled to it. To be frank, to answer your question I think it's better you exchange any big amount in prominent exchanges like Binance and the likes of it, so that if any issue will arise you will be able to contact the neccessary customer service ASAP. Also, their community is large and you can get easy response from experienced members. However, if you don't want to be verified, that is kyc you can be exchanging your assets with a daily limit of 2btc in exchanges like Binance, Bitmax etc.