Hi @eduardomoya,
Welcome to the community! There are several ways you can go about this:
- You can use Loop over items node and split your workflow into multiple subworkflows so that you don’t have to manage your json files at once but in batches. Check out this post here: How to work with large file sizes in n8n? (Downloading into n8n & then uploading to a cloud storage service) - #3 by MutedJam
- You can also try setting the environment variable
N8N_DEFAULT_BINARY_DATA_MODE=filesystemwhich will save the binary data on disk rather than memory and the database. See our docs for more details.
If you’re stuck you can share your workflow in the post so the community can better understand your usecase 
Tip for sharing your workflow in the forum
Pasting your n8n workflow
Ensure to copy your n8n workflow and paste it in the code block, that is in between the pairs of triple backticks, which also could be achieved by clicking </> (preformatted text) in the editor and pasting in your workflow.
```
<your workflow>
```
Make sure that you’ve removed any sensitive information from your workflow and include dummy data or pinned data as much as you can!
Hope that helps!