Can someone help me if my PC won't run the game?

Hi, my problem is that in the game, I play the story mode really well without any FPS issues, but when I enter the endgame and play maps, the FPS drops significantly. I play Amazon with Storm, but I feel like my own skill is causing the FPS to drop even more.

My PC stats are:
RX580
16 RAM
DC M.2 500 gb
rizen 5 5600g

I had issues with big maps with 16 gig memory.

I would update that or turn down the amount of effects and things the game has to keep track of. When you start exploring huge maps and the game has to keep track of everything you have explored it will start to lag.

Their in game memory taxes you system it seams.

but when I play the consumption is at 70% of the ram

Have you tried switching your renderer from DX12 to Vulkan? Since you are running a native AMD setup, it might help. Otherwise, you may be hitting a hard cap with the VRAM of the RX580 which is 8GB.

Look and see if you can enable dynamic culling.