You could always smear a bit of filler in there and get a paint touch up bottle mixed up. I’ve taken plastics into a local paint shop and they’ll mix some up with a little brush for about £5. Or find the paint code and order online.
Edit, I see you’ve already got touch up! One other suggestion is a bit of thin aluminium behind the crack to strengthen it and use some more adhesive.
You see that kind of damage on loads of bikes where the winkers got through the fairing, I prefer older methods where they are bolted onto a proper bracket which normally only sacrifices the winker and easy replacement.
Edit, I see you’ve already got touch up! One other suggestion is a bit of thin aluminium behind the crack to strengthen it and use some more adhesive.
You see that kind of damage on loads of bikes where the winkers got through the fairing, I prefer older methods where they are bolted onto a proper bracket which normally only sacrifices the winker and easy replacement.