Custom Jekyll layout not working

I have my personal web hosted with GitHub pages (here). I want to use Jekyll just for the blog section (/blog) but I’m having troubles setting up this part. I created a new site locally with jekyll new blog and also created the custom templates. These pages work fine when I load them locally (with bundle exec jekyll serve --safe), but not in my page, where the loaded page is just the Minima theme.
I don’t know what I’m doing wrong, so any help will be appreciated.
Thanks in advance!

pd.: This is my first topic so sorry in advance if you see some errors.

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sorry vishalsen6, why is my post going to be deleted?