Birthday Bonus is included in Monthly capping of 10K pts. So you can only earn 5K points Normal + Bonus for all of your txns which will double next month and accelerated points aren't part of it.
Rs. 5000 Txn (with VDC)= 50 Normal (1X) + 50 Bonus (1X) + 200 Accelerated Pts (4X) Next Month = Total 300.
You have birthday so the 50/50 you got for Normal + Bonus will get doubled = 100 not the accelerated as it will come Next month so not part of it but yet part of txn 1000 max. Total 50+50+100+200 = 400 and 400 Bday bonus so total 800.
Go for 16.6K which is 166 (Normal)+166 (VDC Bonus) + (4X Accelrated i.e 166*4) = 996 total and get 332 extra next month for birthday. For max. benefit do Rs. 16,600 x 7 and last one Rs.8400. That's it.
Birthday Points are not part of 1000 max. per txn cap but are part of 10K Monthly cap only.
CC: @6ix9ine @pinki