edit this code sql server 2014

I have code sql server I want to modify it to be simple and fast It works continuously and does not stop 1-If the condition is not met Return to condition check again 2-If the check condition is correct - go to Next 3-When you finish code Return to first condition check again delete from [SMS].[DBO].[M_Out] MERGE [SMS].[DBO].[M_Link] USING ( SELECT * FROM [SMS].[DBO].[M_Log] RIGHT JOIN [SMS].[DBO].[M_Link] On [login to view URL] = M_Link.link_UserId where Id >= 0 and log_Id IS NULL ) as sdjj ON[SMS].[DBO].[M_Link].link_UserId = UserId WHEN MATCHED THEN UPDATE SET link_check = case when [login to view URL] >=1 then '1' else 0 end ,log_StatusCode = StatusCode ,log_Id = Id ; WAITFOR DELAY '00:00:01' MERGE [SMS].[DBO].[M_Link] USING ( SELECT * FROM [SMS].[DBO].[M_In] RIGHT JOIN [SMS].[DBO].[M_Link] On [login to view URL] = M_Link.link_UserId where Id >= 0 and In_id IS NULL and link_Status IS NULL ) as fgfgf ON[SMS].[DBO].[M_Link].link_UserId = UserId WHEN MATCHED THEN UPDATE SET link_Status = case when MessageText like '%رصيد%' or MessageText like '%لديك%' then '1' else 0 end , In_id = Id ,Reply_Message = MessageText ,Reply_SendTime = SendTime ,Reply_ReceiveTime = ReceiveTime ,Reply_UserId = UserId ; WITH CTE AS( SELECT [link_MessageTo], [link_Gateway], [link_UserId], RN = ROW_NUMBER()OVER(PARTITION BY link_UserId ORDER BY link_UserId) FROM [SMS].[DBO].[M_Link] ) DELETE FROM CTE WHERE RN > 1 delete from [SMS].[DBO].[M_Out] if not exists ( select top 1 1 from sms.dbo.m_link where link_check = 0 )RETURN WAITFOR DELAY '00:00:05' INSERT INTO sms.dbo.M_Out (MessageTo ,MessageType ,Gateway ,UserId) select top 1 1 link_MessageTo ,link_MessageType ,link_Gateway ,link_UserId from sms.dbo.m_link where link_check = 0 WAITFOR DELAY '00:00:10' MERGE [SMS].[DBO].[M_Link] USING ( SELECT * FROM [SMS].[DBO].[M_Log] RIGHT JOIN [SMS].[DBO].[M_Link] On [login to view URL] = M_Link.link_UserId where Id >= 0 and log_Id IS NULL ) as sdjj ON[SMS].[DBO].[M_Link].link_UserId = UserId WHEN MATCHED THEN UPDATE SET link_check = case when [login to view URL] >=1 then '1' else 0 end ,log_StatusCode = StatusCode ,log_Id = Id ; WAITFOR DELAY '00:00:15' MERGE [SMS].[DBO].[M_Link] USING ( SELECT * FROM [SMS].[DBO].[M_In] RIGHT JOIN [SMS].[DBO].[M_Link] On [login to view URL] = M_Link.link_UserId where Id >= 0 and In_id IS NULL and link_Status IS NULL ) as fgfgf ON[SMS].[DBO].[M_Link].link_UserId = UserId WHEN MATCHED THEN UPDATE SET link_Status = case when MessageText like '%رصيد%' or MessageText like '%لديك%' then '1' else 0 end , In_id = Id ,Reply_Message = MessageText ,Reply_SendTime = SendTime ,Reply_ReceiveTime = ReceiveTime ,Reply_UserId = UserId ; delete from [SMS].[DBO].[M_Out]