First I will need to assess their quality and usefulness, then decide if your pricing is fair. So start with "review copies".
https://www.blackhatworld.com/forums/free-review-copies-for-marketplace-approvals.303/
I'll be glad to review "engineering" related notions if these are available.
So you claim you're trying to resell them.
Well, this is not something I would encourage you to do.
You won't be able to easily resell them without an audience.
Proper work is in this order:
1. Audience / traffic. 2. Product. Don't start with product, then audience.
If you could just start with product, you'd just pick plastic bottles, pour lemonade into it and become rich. However, first you need customers, then study them and give them what they need.
Do you think we all need lemonade? No, I don't need lemonade. I need professional node.js templates and video production templates for automation right now. So you know what I need. Can you deliver it? I doubt it. With your general offer you can target maybe "general notion users".
And remember, your notions aren't worth $1000. They are probably worthless on their own. What you paid for was marketing. People share this type of stuff for free or opt-in like an e-mail or telephone number.
Notion is hyped up tool in its own. In my opinion it's not a good tool. It's too general. I prefer Google Docs, VSCode and diagrams.net.
