I build a personal finance tool to help people figure out if they've saved enough for retirement

About the tool:

- it takes info about users current net worth, incomes and expense and run projections on future cashflow and net worth.
- It allows user to set up multiple financial goals and manage separate funds for different goals, like retirement and kids college.
- I also built a tax engine to automatically estimate tax for incomes and any withdrawals from taxable account and tax deferred account

My problem:
Now I'm struggling on sales and marketing. I'm considering sending messages to people on LinkedIn and ask them to try my product, but I'm concerned that this is very inefficient as I'm looking for people thinking about retirement or retire early, but linkedIn is a place people looking for jobs. What other channels I can try? I'm also open to make long vs short videos. Open to any suggestions or ideas. I'm completely new in marketing and sales.

What I can help:
- If you are considering retire early, I can help with building projections and answering questions. My tool also has free trial and demo: https://www.nauma.ai/
- if you have questions about building product, I can also help with my experience.