Improving airflow of Jonsbo UMX3 case

Hello, i recently upgraded my GPU from a RTX 3070 to a RTX 3090 FE and it's getting too hot. The CPU is a Ryzen 7 3700X with the Wraith Prism cooler (fan blows air downwards). I've created an *ugly* drawing of the airflow here: [https://imgur.com/a/YEV1mvM](https://imgur.com/a/YEV1mvM) ​ The case has no openings at the front. The PSU sucks the air out of the case and blows it back in towards the top. At the bottom there is an air filter and there are two openings. Fans can only be fastened there with cable zipties. I am considering putting fan(s) there blowing upwards (after I have gotten rid of the SSDs there). The GPU will block most of the air from reaching the rest of the case unless it goes through the GPU. I'm also considering changing the orientation of the fan at the back so it will blow the air out of the case. The airflow of the RTX 3090 is visualized at [https://assets.rockpapershotgun.com/images/2020/09/Nvidia-RTX-3080-design.jpg](https://assets.rockpapershotgun.com/images/2020/09/Nvidia-RTX-3080-design.jpg) Thoughts? Suggestions?