Create cursor inside cursor - sql-server

Question

I am pretty new to the cursor. I am trying to run cursor inside a cursor. Help is appreciated. Context: I am trying to run index_optimize stored procedure through all databases when SQL Server starts.
USE [master]
GO
CREATE PROCEDURE [dbo].[Run_through_database]
AS
BEGIN
DECLARE #DatabaseName AS varchar(500)
-- Provide the name of SP that you want to run
DECLARE #SPName AS varchar(128) = 'dbo.index_optimize'
DECLARE DBCursor CURSOR FOR
--Filter the list of the database in which stored procedure exists
SELECT NAME
FROM sys.databases
WHERE database_id > 4
OPEN DBCursor
FETCH NEXT FROM DBCursor INTO #DatabaseName
WHILE ##FETCH_STATUS = 0
BEGIN
DECLARE #DBName AS nvarchar(500);
SET #DBName = QUOTENAME(N'' + #DatabaseName + '');
-- Use Dynamic SQL to change the database name and
-- execute stored procedure from that database
EXEC (N'USE ' + #DBName + N'; EXEC(''' + #SPName + ' '');'
);
FETCH NEXT FROM DBCursor INTO #DatabaseName
END
CLOSE DBCursor
DEALLOCATE DBCursor
END
USE [master]
GO
ALTER PROCEDURE [dbo].[Index_optimize]
AS
BEGIN
DECLARE #Objectid INT, #Indexid INT,#schemaname VARCHAR(100),#tablename VARCHAR(300),#ixname VARCHAR(500),#avg_fragment float,#command VARCHAR(4000)
DECLARE AWS_Cusrsor CURSOR FOR
SELECT A.object_id,A.index_id,QUOTENAME(SS.NAME) AS schemaname,QUOTENAME(OBJECT_NAME(B.object_id,B.database_id))as tablename ,QUOTENAME(A.name) AS ixname,B.avg_fragmentation_in_percent AS avg_fragment FROM sys.indexes A inner join sys.dm_db_index_physical_stats(DB_ID(),NULL,NULL,NULL,'LIMITED') AS B
ON A.object_id=B.object_id and A.index_id=B.index_id
INNER JOIN SYS.OBJECTS OS ON A.object_id=OS.object_id
INNER JOIN sys.schemas SS ON OS.schema_id=SS.schema_id
WHERE B.avg_fragmentation_in_percent>30 AND A.index_id>0 AND A.IS_DISABLED<>1
ORDER BY tablename,ixname
OPEN AWS_Cusrsor
FETCH NEXT FROM AWS_Cusrsor INTO #Objectid,#Indexid,#schemaname,#tablename,#ixname,#avg_fragment
WHILE ##FETCH_STATUS=0
BEGIN
IF #avg_fragment>=30.0
BEGIN
SET #command=N'ALTER INDEX '+#ixname+N' ON '+#schemaname+N'.'+ #tablename+N' REBUILD '+N' WITH (ONLINE = ON)';
--Can add following line for index reorganization. Else remove following line.
SET #command=N'ALTER INDEX '+#ixname+N' ON '+#schemaname+N'.'+ #tablename+N' REORGANIZE';
EXEC(#command)
PRINT #command
END
FETCH NEXT FROM AWS_Cusrsor INTO #Objectid,#Indexid,#schemaname,#tablename,#ixname,#avg_fragment
END
CLOSE AWS_Cusrsor
DEALLOCATE AWS_Cusrsor
End
GO