hello all, want some advice on my masterbed room heat issues. I got a very large L shape window, not sure what is the developer thinking because the view not so good also.....

I got install tint recently, but my room still feels very hot in the morning. my room temperature around 30 degree Celsius but feels way hotter than my other room that is 31 degree Celsius and only my room got this issues.

And out of all 7 casement window, only 3 can open and it is open from below for safety purpose and the gap is so small that i can hardly blow stand fan at it.
the major concern is that the heat built up so fast early morning and it just stays there till night time even after install tint. So what can i do to keep the room stays cool? blackout curtain? or any suggestion?

Tint only filter out the radiation mode of heat transfer.

The major heat transfer via conduction & convection are still present. The best way to address the convection & conduction is the selection of the  material of the surface with low U-value material.

If got money, put the double glaze window with vacuum cavity in between. The vacuum will stop the convection & conduction heat transfer. It will block the noise transfer also.