Hi
If you do decide to do a clean install and, you don't have to install everything or for the most part anything on your SSD.
I have only my Windows installation and a few small programs like CCleaner etc. on my C:\ drive.
All of my other software I install on my D:\ drive (a conventional 1TB hard drive partitioned into D and E drives of 500 GB each).
All you need to do when you install a new program or game is to change the address while installing.
For example if it says install to, C:\Program Files (x86) just change the C to a D, i.e. D:\Program Files (x86) Adobe Photoshop.
Windows will create a new Program Files or Program Files (x86) folder and run the software from there.
By doing this you can keep the size of your C:\drive...