Let us formulate the tasks. What needs to be done, whether you want to change the behavior recalculation difficulties? It is recalculated once a day. If mains power suddenly drops 10 times, the recalculation has to wait 10 days, it is great this problem? After all other coins complexity recalculated longer.
what would be needed,
would be to fork back to the old chain,
then adjust the difficulty retarget (on the old chain, it takes forever to get a block)
and may-be eventually put an higher block reward (which works also when people are mining)
The proper thing to do would be to just forget about this shitcoin. If you're going to go through all that work then might just as well launch a new coin without the scammy instamine.