Have you a download link so that we (the minecraftforum community) could have a look & maybe see whats wrong.
I can think of a couple of things off hand though:-
Inside your resource pack there should be a 'pack.mcmeta' file.
Opening this up & you should see a line that says "pack_format":4,
If the number is different then 1.14 does not recognize the pack as compatible
I don't think this is your problem since you say it's not showing up - it would show up but when you try to select it you would get a warning
The other problem it may be is how the file was zipped.
I don't know what zipping package you are using but I used bandizip & I have found out that IF you select the FOLDER all the files are stored in & select 'zip' then it won't show up in minecraft
But if you OPEN the folder & select all the files/folder shown in it (typically you would select the 'pack.png'/'pack.mcmeta' & a folder called 'assets') THEN right click & zip - you end up with a ZIP file along side the 3 selected files/folder
- you then copy this Zip file over to minecraft resource folder & it shows up in the game
I suspect you selected the folder & zipped it - try opening the folder, select all the files in it, then zip it up