See not bore you with what a formal definition of dimensions is or its concept in abstract maths, Dimension can be informally said as the least amount of coordinates required to locate a point i.e. a 1D line as only a x axis co-ordinate, a 2D square would require 2 coordinates and a 3D Cube would require 3 and now you see the pattern.
Now back to my main point , There really isn't a 4th Dimension as you can't differentiate between dimensions, I'll help you visualise this better If you mixed 3 different cups of water into a jug it wouldn't be possible for you to differentiate between them similarly like our 1D,2D and 3D dimensions but if I add a cup of oil to it it would be easily differentiable like our dimensions of time, This is why in formal notation we use 3+1 Dimensions to represent.
Not only that there are string theory branches that support 9 and even 27 dimensions, unfortunately I am not smart enough to fully comprehend them yet but if you are interested in such works, There is an amazing paper detailing a theory of with 2 dimensions of Time.
This is not the end, See if you dm me about how you liked the article I'll give you a very interesting titbit that will compress this entire article into a single anecdotal line that will add an extra 𝓓𝓲𝓶𝓮𝓷𝓼𝓲𝓸𝓷 to your understanding and might even make me look a bit obnoxious for writing an article on it .
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