You have two different accounts under the same email. If you choose to log in using the ‘Email’ option you’ll find your designs there. I think you’ve tried using the ‘Google’ option, but that account doesn’t have any drawings.
A few months ago we changed our business model to support the continuous development of uMake.
We think the pricing is fair and affordable for most professional designers.
In case you’re a hobbyist and just exploring 3D for fun or for a personal project, maybe the ‘Education Edition’ would be a better fit for you. It includes most of uMake core features and as powerful as uMake is.