It's your project, to the extent that you own the copyright. You are free to switch the license on your project, etc. If anyone tries to shame you for this, you should pay no mind. (Edited to add that you are also free to abandon it, and you could do that with a clear conscience.)

Likewise, users are free to continue using open source software without payment or donation, to fork the project, etc. If anyone tries to shame them for this, they should pay no mind.