"I would like to borrow my cryptocurrencies with an interest" is confusing. Did you mean lend?

You can visit the lending board and see how veteran lenders do their business https://bitcointalk.org/index.php?board=65.0

Lending cryptocurrencies has it's risk and rewards. Due to the market's volatility, you never really know if you'll profit or not. If you don't care about the fiat value, I think there is nothing to worry about.

What cryptocurrencies are you planning to lend? If it's an unpopular coin or token, I don't know if someone will even take that.