Default How do I reformat Apps partition?

Out of 1.97GB of space I have used 0.93GB and only have 40MB left which is making a lot of yhings not work.

Clearly something is taking up more space than is being reported so it seems to me I should double that 1.97GB to 4GB to solve the problem.

I currently have a 64GB SD and will upgrade soon to 128GB so losing a couple of internal GB storage to make the rest of the phone work will be more than worthwhile. I have already moved a number of larger Apps to run from SD card as a bandaid temporary solution. But GMail can't sync so I really need to fix this.

But I don't specifically know what I need to do. Can someone tell me what I need to do to repartition back into a working phone without losing EMEI or whatever?

Thanks in advance for everyone giving this some thoughts

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