In Task Manager (Win10 Home), I can see that my applications (Acrobat, Word, Excel, SDL Studio etc.), when doing huge processing tasks, never use more than some 25% of the CPU (AMD Ryzen 5 3500X 6-Core 3.60 GHz) and 8 GB RAM (from the total 32GB).
Is there any way to use the full capacity of my investment?
Unless you want to run a RAM disk (which I wouldn't), you don't need to force everything to reside in RAM. Computers have gotten a lot smarter about how to use RAM over the years. It's basically a non-issue at this point.