How to convert free users? Need help

Hello community!

I'm reaching out today because I need your help on converting our free users.
I'm the co-founder of StationDB, an instant no-code admin panel for database editing.
Our product is a SaaS, we have a:

• Free plan: The user can fully use the platform, have up to 2 members in his team, but his project will expire after 2 weeks (users can most definitely upload their project again after it expires, and keep doing so without upgrading)
• A plan at 17$ per user per month that has all features
• A plan at 29$ per user per month that has all features + the white label feature to use the admin panel on your own URL and with your own branding
  https://www.stationdb.com/#Pricing

We've had an experience on AppSumo select recently, that I will share with you in another post.

We are currently looking to build our MRR. This past month, we've started a Google Ads campaign, and here are our numbers:
In a month we've had 150 new users -> 40 users confirmed their email address -> 30 users uploaded a database -> 15 users used the team feature
All these users stay on the free plan and do not convert.
I would really like to have your take on this, as we think that our free plan restricts the wrong features.
We think that if the database expires while the user is away, it won't be painful enough to encourage him to upgrade, whereas if we restrict a feature that the user is actively trying to do (add a new member to the team, import/export a CSV of the database, filter the records etc), there might be more chances that they'll upgrade.

What do you think?

Looking forward to reading you!