[tyri_kai_psomi]

this is obviously my cheap opinion and I am looking to get to the point where you are with my side project: I think you could have the best of both worlds by getting rid of your free plan. The key would be to wind down your free plan in a way that is respectful to your current users and you could do this by offering them a steep discount on the first year's terms or giving them ample time to make a decision once you discontinue the free plan.

You have probably enough word of mouth now and establishment to build off of with your product that you can get some new customers without it. You can always do trials or free POC periods.