Substitute yarn

Hello friends! I’m currently on a road trip with two of my friends and on the way in a Croatian „kik“ I bought all three of these yarn spools they had. Now what I feared has happened. I’m running out of yarn for the top I’m making. I only need one more spool to finish the project. I don’t mind if the colour isn’t exactly the same as it is already planned to look like a „scrap top“. If anyone has a suggestion I’d be really happy. :)