How to compensate for diminished taste when cooking?
I'd say experience will be your best help in the long run.

Use known recipes, quantities and ingredients.
Err on the side of blandness; better have people add salt/pepper/hotsauce  than spit it out because you over did it.

Try to have someone with you when you try out new recipes or ingredients so they can help you gage the taste and smell so you can adjust the ingredients.

Good luck.