I really don't think there is a loss to miners or drop in their rewards as long as Bitcoin's value is higher, I was not expecting any bullrun till the end of this year and I was amazed even by the surge we have seen in last 6-7 months which was not expected. My plan would be to continue with the existing DCA and keep a track of market trend because during bull timing matters the most as you could miss rally by minutes, In short I am accumulating Bitcoin to sell it during peak and reinvest a part of it in altcoins during bullrun.
What you are assuming is a temporary phase and it has already died down due to the sudden crash of Bitcoin price. Before halving there was a Bitcoin bull run and the price of it shot up to $73K, when they were getting
BTC6.25 for every block. Now, Bitcon price to a correction and it is now $64K when every block the miners mined is giving half of what they were earning.
There will be a decrease in the amount the miners are earning now. The only problem is that the spam of BRC 20 is still making them earn more in USD than they should earn. By the way, Bitcoin creator never thought that USD will be significant when he created it. It was all about Bitcoin and Satoshi, it was never about USD and Cents.