Any suggestions?

Well, you could top it with canned cherry or blueberry  or apple pie filling and maybe some whipped cream for your own home use? Or drizzle maple syrup and whipped cream ?

Though not with cheesecake, I have missed adding sugar to a cake before.  My most recent mistake?  Read 1 1/2 sticks of butter as 1 1/2 cups, did this not once but twice before realizing what I had done. Cakes had almost a pound of good chocolate in them. Expensive mistake. 

We all have those days.  Good luck.

you could ice it too

you could also bake off a real short cheesecake layer and put enough sweetener in there to help flavor the other -- but i would only serve this to family not for a client -- i'd redo it for a client --

I forgot the salt in a giant batch of bread once -- it was awful -- had to do the whole thing over took a long time when i should have been off work! proofing etc -- it happens -- terrible but i feel yah

best to you