Ask HN: Just got some 3090 cards, any profitable project you can suggest?

Just replaced my cards(becoz out of warranty) with 3090s and they are very expensive... Any profitable project you can suggest?(No Mining) My skills: Building custom machine learning models Rebuilding paper's models

The projects I can think of: 1/ renting out the gpus (as far as I know, there are no service to rent out only the gpus but the vms) 2/ providing a deep learning api.