Hello friends i am new to this community..
Need some help for my old honda stunner disc model

I have completed 22k kms
And getting an average of 43kmpl.
My right side panel where honda sticker is placed is broken.
My bike is not giving nice pickup, i mean when i accelrate the bike i feel as if there is no petrol, the acceleration is also tooo hard to res.
The engine sound has also increased a lot.
Now the point is-
Next week i am going for servicing what all things should i do?
I am keeping an budget of 5000 rs for changes.
What things should i change...like which plugs, which air filter, which tuning etc etc.
I need a smooth and very lesssss noisssyyyy bike.
first priority average and then pickup.
So please advise me...it would be really helpful.
thanks thanks thanks!!!