Thoughts on growing HR SaaS?

Hey friends!

For a past year I have been building employee pulse check slack app. (url for context - https://wellb.ee).

I have followed a lot of tips that were posted here. I started from the problem and worked my way up. Did early validation and interviews with possible buyers / clients. So the product MVP is finished for now.

I have a few companies already onboarded and already had interest from angel investors. But I would like to grow it a bit more.

Would community give me any tips in growing this kind of software? I have already hired SEO consultants and planning on doing PPC. But is there any cool growth hacks that worked for you?

I would really love your help. Might even give some tips my self. Cheers!