I would suggest trying to reduce your dose at the day.
I try to have it just about right so that it slightly stimulates me, but it is still me that needs to concentrate.
Then you arent so exhausted in the evening and can do stuff.
On 30mg of Elvanse I was extremely stimulated and completely worn down afterwards.
Now on ⅓ of that dose, this is way less extreme.
Still a bit, but not that much.
You could also try medication that doesnt last as long. You would move the tiredness to the end of the workday, and could possibly have recovered already in the evening.
You know, set priorities. Currently it seems your priority is to work the best you can. But this means your brain is exhausted in the evening.
I oppose the other comment about just taking more. Be careful with your brain.
Cheers!