Subtree of Another Tree (Leetcode 572) [Optimisation required]

Problem Link: https://leetcode.com/problems/subtree-of-another-tree/

class Solution:
    
    def similar(root1, root2):
        
        if(root1 is None and root2 is None):
            return True
        elif(root1 is None and root2 is not None):
            return False
        elif(root1 is not None and root2 is None):
            return False
        else:
            if(root1.val == root2.val):
                l=Solution.similar(root1.left,root2.left)
                r=Solution.similar(root1.right,root2.right)
                if(l and r):
                    return True
                else:
                    return False
            else:
                return False
            
    def isSubtree(self, root: Optional[TreeNode], subRoot: Optional[TreeNode]) -> bool:
        
        if(root is None):
            return
        if(root.val==subRoot.val):
            if(Solution.similar(root,subRoot)):
                return True
        l=self.isSubtree(root.left,subRoot)
        r=self.isSubtree(root.right,subRoot)
        if(l or r):
            return True
        return False