Cannot boot into Windows after creating a new partition

Hey guys,

I'm hoping for some help regarding booting into Windows again. I created a new partition, hoping to merge it with my Windows partition in an effort to create more space for my Windows (by following a YouTube video).

However, after creating the partition and restarting my mac (while pressing option), I could no longer see the option to boot into Windows.

When I look in disk utility, I still see the Windows/Bootcamp partition as shown in the following image:

The 'U' partition is the newly created partition I made in hope to merge it with my Windows partition.

I've tried going through the majority of other discussions/threads which were opened in the past about the same issue, but had no success (such as booting into recovery mode and typing in some commands in the terminal as instructed by other discussions).

This is why I'm opening another discussion.

I would appreciate some help as soon as possible. I will cooperate to the best of my ability and ensure quick replies.

I've provided an image of my mac details for reference:

[Image Edited by Moderator to Remove Serial Number]