Does your system have a single SSD or multiple? It's good practice to separate functions: one SSD for programs, one for source data and one for temp storage.
16GB of RAM seems a little on the low side to me; how much have you reserved for Ae and other Adobe Apps?
Also, what does your intro entail? Please check if you have set it to 8-bit or 16/32-bit rendering. Also, if you have any images included, make sure you pre-process them through Photoshop, changing them from 300dpi tot 72dpi.
I did a project last week that took about 7 minutes a frame and that was normal and expected for what I was doing. Last night I rendered another project and the rendering speed was about 40 frames a minute. That was also normal for that type of project. Both were 4K.
Without workflow details and project specifications it's impossible to know if your render speed is slow. The only way you can know if it is slow is to gain enough experience using AE to know how long specific tasks take to render. Welcome to the world of compositing and motion graphics. It take aa while to render.
Plugins used in in AE project?
There are so many factors that contribute to render speeds.
One of the most common, system capability aside, is quite simply the effects used.
What are the key plugins/effects used? It may help in identifying why it's slow but past that, you will need to wait or find a different way to achieve the effect.
Sometimes, you just have to wait.