I've seen Bitcoin went down more than 80% last 2018 and for sure, there are some investors who experienced way more losses than you have right now.
Same situation here. Your impermanent loss is 70%, and it will not be permanent unless you will sell it. Right now there are investors who are experiencing the same as you right now or even a higher impermanent loss.

In 2018, that downtrend took almost a year before we see some daylight. Now I don't know how long this will happen and there is a chance that it last until the end of the year. The best thing to do right now if you are down 70% is to just stay calm, accumulate more and be patient. Many of us are down as well. Even CZ and Vitalik are down in their portfolio as well. It will recover soon. Just be patient .