My strategy is to increase the number of Bitcoins I have. Just like you said, the Bitcoin price in the near future has the potential to reach at least 30-40K. That's why you say how much Bitcoin, so much profit.
I have been also planning to increase bitcoin and ethereum since the prices now are very cheap. But I am also planning to hold it since I dont think the red in the market will be over soon, so patient and wait for the future.
If you are a long term holder then you no need to worry about the red days it will over soon so you have to grab as much as coins you can in this bear market but as you said the recovery will be too longer this time in my opinion so you need to be careful that amount you are going to invest because you will face loss to in short term.