[SOLVED] What should I upgrade first?

Feb 24, 2021
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Currently I have:
MOBO - A320M-DS2
PROC - AMD A8-9600 RADEON R7
HDD - BARRACUDA 500GB
GPU - NVIDIA GEFORCE GTX 750 TI
RAM - 8GB DDR4
PSU - GENERIC 700W

I'm thinking of upgrading my PSU first but I don't know a lot about building computers, please bear with me.