...I am currently invested in 7 different coins and I want to hold them all for at least a year adding to each one when I feel the price is low but how can I tell that? ..
It all depends on which 7 coins you decide to invest your savings in. You are writing about Ethereum and it is a great investment, despite the fact that its price has now decreased, but in my opinion its price is very good to buy. But you still need to leave part of the £ if the price of ETH still decline.