You need to reveal your current salary sooner or later.
You can generally ask them their budget for the position to reduce chances of getting lowballed.
However, in the current market this might not work.
So you can try either with remote jobs and/or get one opportunity and then keep trying for better.
If you choose the latter option then please ensure to not ghost any company on the joining day.
Apart from that, another perspective to consider is 13 LPA is better than 7 LPA.
So go with whatever works for you from the above.
Wishing you the best!