First let us do a little simple physics. Your case can only flow as much air in as it is flowing out .. the in vs out / out vs in airflow is the smaller of the in or out. Your case has 5 fans trying to push air into a case with only a back and a bottom vent to let air out. That means the 5 intakes an only move as much air into case as back and bottom vents and let out and as the back and bottom vent area is only about half what the front and top are, your intake fans can only flow at most about half as much air as their potential. And in a system needing a 140mm of air for CPU cooler and 1-2x intakes for GPU that's not enough cool airflow.
Top fan farthest to the back is running the opposite direction of what it should .. if a top fan is even used there.
Middle top fan fan is blowing down into cooler that has 2x fans trying to flow air back thru cooler and out of case.
Only the front most top fan might be helpful, and it's limited by 5.25" bay cage.
As others said, remove the PSU shroud and use bottom intake to flow air up toward PSU.
That bottom intake will also flow much better if case is raised 20-30mm so there is about 40mm of space between bottom of case and what it's setting on. This give about the same airflow area to bottom vents as bottom vent area airflow. I use and open top caster base bu
t longer feet, square wooden blocks, hockey pucks, spray can caps, etc will all work. Here's link to details about this:
Above link also has info about how restrictive vent grill and filters are.
Here is a link to Define R series case mods to improve airflow.
Not sure if I've posted it, but here is link to info about how airflow works and how to optimize case airflow and cooling.