Lower the brightness on the background.
Change the opacity on the text if you think that you're happy with black being the colour.
Get a better picture and learn how to cut properly. If you find a nice picture and you think you've cut it decently, see if it stands out too much. If it does, change the opacity until you're happy.
The background is nice but the colours are just too bright, I won't say it was a bad choice in colours as different backgrounds work with different colours. Try a couple of other colours though.