So really Bitcoin really has a long way to go before it starts to be attractive again for miners starting up their rigs back, I don't know the exact BTC price for that but it is surely not this one.
There is no general level miners are comfortable with. If you look at current prices and the hashrate, it shows stability around 35Eh/s and that's perfectly profitable for those who are mining. In fact, mining has become more profitable for miners now the block times have gone down to like 9.2/9.5 minutes while they were like 10.5/11 minutes not even a week ago.
Most of the miners who are leaving are those who bought their equipment during the bull run last year and probably expected it to stay around or over the $10,000 level for ever. If you haven't done anything to optimize your operation, you'll be out of this business in a matter of months or even weeks.
Mining was EXTREMELY profitable during the bull run with how there wasn't enough hashrate that could be added to the network. Just like how we have get rich quick crypto investors we also have get rich quick investors in the mining space.