Simple Things That You Could Customize
There are somethings that might be fits your resource pack:
Custom Looking Resource Pack Banner

Firstly, you could change the resource pack's icon by adding your custom .png image by named pack into your resource pack file.

Secondly, you could change the resource pack's description by editing inside of pack.mcmeta file:

Do not change your pack_format code. It shows what Minecraft versions used for.
Finally, you could change the resource pack's title by creating/editing(if exists) en_us.json that should be created in ../assets/minecraft/lang/ path(if doesn't exist):

Then, you should add/change a line like this:
After, go to the game and execute those commands by ordered:
Changing Default Minecraft Font

You should create a folder that named font in ../assets/minecraft/textures/ path.
After, you should drop the image at below into ../assets/minecraft/textures/font/:
Don't change name of ascii.png or it won't apply to the default font. (This example will work only with clients that uses American-European Alphabet.)
After, go to the game and execute those commands by ordered:
Top of the Screen Text (Bossbar Text)

Firstly, you should create a folder that name gui in ../assets/minecraft/textures/ path.
Create another folder that named sprites in ../assets/minecraft/textures/gui/ path.
Again, create another folder that named boss_bar in ../assets/minecraft/textures/gui/sprites/ path.
After, you should drop the images at below into ../assets/minecraft/textures/gui/sprites/boss_bar/:
And, of course, you've to use a bossbar plugin or command blocks to show to the players. (We defined 6 Notched White Bossbar, so, we've to use it.)
After, go to the game and execute those commands by ordered:
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