Best smartphone under 15k

Fellow Dimers & techies! My Asus phone is giving up (battery discharging rapidly even while switched off) and I've been off the smartphone scene since I bought it and just dont have time to research. So please help me choose the best smartphone under 15k (can stretch max by 1k).

Most important - 

Minimum 6GB RAM 

Best in price processor 

Good Speakers  (loudness & clarity) 

Best in price Camera, esp for low light 

Preferably vanilla Android or at least custom ROM with absolutely minimum bloat & no ads or such

Would prefer to have:

3.5 mm jack 

Would not prefer to have:

5G 

Thanks so much in advance!