Back when I was in Platinum I’d get frustrated for the same reason as you. It seemed I’d get so high only to drop like 
again.
I joined the forums to see if I could find any guides, etc. The 2 links below helped me tremendously and I highly recommend reading both.
It is alot of reading, however the explanations are very exact and easy to follow.
Hang in there and you will get there. Don’t get me wrong I still get a tad frustrated, however that is down to RNG anf that I can’t win them all.
I found these guides to be very helpful:
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