FYA, if you upgrade your account, you do NOT have to reset it to receive the upgrades. Here's a which is still relevant, made a while back that will answer most of your questions about account upgrades.
From the :
It's the return of the Black Friday Sale for Escape From Tarkov! Black Friday traditionally means the start of the Christmas present buying season, so perhaps its time to buy that action filled Tarkov-present for your friends or loved ones? Or for yourself? If you buy more than just one copy, there's also a set-discount! Please note that the discount is only available for a short time!
Standard Edition – 25% off
Left Behind Edition – 25% off
Prepare for Escape Edition – 25% off
Edge of Darkness Limited Edition – 25% off
Discounts on all upgrades – 25%
Permanent discounts for the purchase of several pre-orders as a gift will not be summed up with discounts
2 sets – 10% discount
3 sets – 15% discount
4 sets – 20% discount
Discounts start November 27 00:01 MSK End of discounts 28 November 23:59 MSK
Source: https://www.reddit.com/r/EscapefromTarkov/comments/k1os1d/black_friday_discounts_ends_28_nov/
