As an American expat, I don't get credit reporting here at all....
I had never heard of Credit Simple, but just checked and my score with them is "good", while my Experian and Equifax are both excellent and says I am in the top 5% of age/state/post code...
I hadn't had any inquires since March 2019 for a credit card that was opened and closed after 11 month. Prior to that was 2017. But, I applied for HSBC card last year, and was declined. I've never been declined for credit. Have 2 home loans that we've never been late on, all payments are on-time for credit cards (I don't know why they don't report paying in full vs. paying minimum or partial balance here, as we pay everything in full each month).
I suppose I could cancel some things we never use.... GO (harvey norman/domain) that just sits waiting for our next redecoration, an overdraft that I've never used. Will that increase my score though? They both report "on-time" every month though.