If I stick with waht you all are saying then It kind of impossible.
but i'am not good at GIMP.
First, as I explained in my post it is possible but a lot of work - much more work than a regular map. And it doesn't matter if you're not good at GIMP at the moment - that is what training and experience is for, you'll get better in a year or two when working with that.
And you don't need to be an artist to do these kind of maps.
From what I can see the map in your screenshot is most likely done with PVGames' Medieval Resources, which are pre-rendered pictures and tiles available for purchase in the main shop here on this website.
By purchasing those sets you eliminate the need for Mathematics that JonForum mentioned, that would only be needed if you were to use real 3D instead of pre-rendered pictures.
If you have those packs, you also don't need to be an artist and paint your maps, you only need to be able to import and move the pre-existing parts on your parallax picture - that is a bit more complex than placing tiles because you have no grid and unlimited layers (instead of 3), but follows the same principles and can be learned by anyone who's willing to put in one or two months of tutorials and training.
And one or two months is nothing in game development - any even halfway decent game will take several years to develop if it is done without a professional team, so reserving the first two or three months to learn what you need to do for all parts should not be a problem.
This is especially true if you want to use parallax mapping - see my point 1 above, parallax mapping usually takes five times the work of regular mapping (unless you're very experienced with it)
There is one thing you really need to learn (and sorry, but your post so far give indications that you still don't understand that, not really and deep in your heart):
Game development with quality means work.
There is no problem playing at it if you don't intend to get anything other than fun from it, but if you want to create a quality game that means you have to put in work as well as being willing to learn and train yourself.
There is only one single shortcut at all for this, everything else is an illusion:
If you don't want (or can't) put in that work/time, then you can pay others to do that work for you. But that is never cheap.
(Team recruitment only works if you can already prove that you put work into your project, no one wants to join a team where the leader itself can't work on the project, not without other compensations)