CPU/GPU usage while rendering

I'm rendering a video that is heavy on effects and layers + using 3d elements. The render time shows 5 hours and 43 minutes remaining after 7 minutes of rendering, which sort of makes sense, but it seems just a little longer than I would expect. 

My main question though is how can I get my CPU or GPU to be utilized more during renders? My CPU is only running at around 26% capacity and my GPU at 7%. 

I was able to get a new GPU recently (RTX 3060 Ti), and it should improve render times from a 1660 SUPER.. right? Especially if I use GPU acceleration... My render times are slower with my current GPU while using GPU acceleration, so my secondary question is, will this new GPU actually speed up my render times? 

Please also let me know after all this information if 5 1/2 hours of render times does make sense, because I don't really know if it does or doesn't.

My system:

Ryzen 5 5600X

GTX 1660 SUPER (upgrading soon to a 3060 Ti)

32 GB RAM

1 TB WD SN550 NVME M.2 SSD

Using AE CC2022 & ME CC2022

UPDATE:

Render crashed, now the project is taking forever to load the preview. This just started happening in the past couple days. My last render took around 15 hours, this did not used to happen before while equally heavy effects on projects.

The project has an imported .aec file from Cinema 4D, so a png sequence (duplicated 3 times with effects on different layers) and a camera. 

9 Adjustment Layers (including 3rd party effects, one is RSMB)

2 Optical Flares

5 Solids with Trapcode Plugins

Around 5 other things like a black solid, some blurs and a couple video clips using 3d layers.