In the world of trading, I have seen traders tried to focus on one pair, thereby missing opportunities to make money from others.
It's best as a trader to have in my personal opinion at least 5 pairs. Include four currency pairs, then one metal or commodity pairs, if possible stock.
I personally focus on up to ten pairs, and this allows me identity breakouts on one or multiple pairs and select the one to trade on trends.
Try this technique and see how fast you grow your capital, Goodluck.