CRS cutoff keeps increasing/decreasing (just like the stock market), the higher the demand (and thus the backlog), the higher the cutoff goes. This changes from fortnight to fortnight (they give ITA’s every couple of weeks or so, as you can see from the cutoff trends.)
Try simulating 8.0+ on IELTS and see how your score changes. It seems you should be scoring well on experience and your age isn’t that much to score less. At this point I would recommend that you (and maybe your spouse) take the IELTS asap and try to get the maximum score possible. Then create a profile and see what CRS score you (or your spouse) actually get (the CRS calculator was a bit off when I simulated my score; I actually received a lot higher than what it was simulating). You just need the ITA once, and the cutoff score might dip down again given that DHS isn’t going to cancel H1B extensions atleast for now 
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Check out other posts on this forum that has addressed questions about how to improve the score. However, the longer you wait, the lesser you score on age.