How to skip first few elements from array?

I have an array with total 5000 elements and at one functionality, I only need last 3000 elements only to proceed further.

for that I have tried following solution.

//skipping first 2000 elements
list = list.Skip(5000 - 3000).ToArray();

This solution is actually giving me desired solution, but when I ran profiler on my code, It is showing huge amount memory allocation on this line.

I have to use Array only due to carried on legacy. and very frequent ToArray() doesn't seem to be good for performance.

there is also possible solution,

//reversing whole list
Array.Reverse(list);
//restricting size of an array to 3000,
//so first (as reversed the list, they are last 3000 elements) 
Array.Resize(ref list, 3000);
//again reversing list to make it proper order
Array.Reverse(list);

but this is even worse in time complexity.

Is there any better solution for this, which doesn't need casting from List to Array ?