Ways of creating accounts to save memory

Hello,

I'm thinking about ways of reducing the ram my sites are using. I've found a few discussions on tweaking cpanel settings to save memory, but my questions are more general

1: Do 'suspended' accounts use any memory? am I best terminating them?

2: Is it better to create a seperate account in the WHM for each website, or one account, with multiple addon domains?

3: does routing traffic through something like cloudflare reduce memory?

4: also - is there any way I can look at my list of accounts in WHM, and see which account is using the memory?

I'm not an expert in server tweaking, so I'm just looking for easy ways. If I can reduce my sites memory usage, I can downgrade and save money. However, if it's going to take hours to save a few mb, it's easier just to pay for the memory!