It seems you are making a scatter plot between two categorical variables (which is usually something you don't want to do), that is why you get the crouded x-axis, it is not clear what kind of variable you are mapping to the x-axis, because of the very un informative variable name (...4) and the unreadable tick labels. To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one: