Hey, I read your profile bio and what your creating sounds awesome and much needed in the Saas community.
When it comes to social media platforms I feel like LinkedIn and X are both great! I would focus on one and try to build and audience there as you will get much better results as well as it's much easier to provide quality content for one platform.
As a start-up your time is very valuable and resources are probably not unlimited soo focus on X if you feel like it :)
Good luck!