I get 2400 free row but still 500 row allowed

[AymenM]

So you should definitely do so and see if the problem disappears.

This link will help you

Sorting Google sheet

Is there any particular reason you need them completely deleted? It might be more trouble than it’s worth but I think the best option would be some sort of google sheet add-on or a script. Here are a couple things I found with a quick search.