Below 10K for BTC is the time to start investing if you want to target the next bull cycle down the road in a couple years or more.
Doge is already at the Buy price since it went below 10cents and really getting worthwhile @ 5cents and below if you want to accumulate as well for the next cycle.
Yes, sub $10k BTC is the time to buy I think we have a few more months to get there, perhaps end of 22 early 23.
IMHO Doge is still sky high at 10 cents, or even 5 cents, better to wait until closer to 1 cent or even under.
And to the OP, just because you have mining rigs does not mean you need to use them. As a long time miner I have in previous bear markers shut down my rigs and just bought coins directly with the money I would have sent off to my power company. If the cost of mining coins is more than you can pay for them directly, do not feel you *must* mine.