From looking at your screenshot it seems the error message might be spot on - you’re simply processing too much data for your n8n instance to handle. The situation is documented here, along with a few common workarounds:
If you control the amount of data directly you could simply consider processing multiple smaller files in separate executions instead of one big file in a single execution.
In case you can’t change the input file size you could try something like this instead: Convert Binary file To JSON or CSV - #5 by MutedJam This is rather cumbersome though and you might have a better time simply increasing the available memory on your machine.