./xmrig -o stratum+tcp://randomxmonero.auto.nicehash.com:9200 -u WALLET ADRESS -p x -k -a rx/0

Other than the Antminer L7, you can also check out the Innosilicon A10 Pro+, Whatsminer M21S, Goldshell LT6, Goldshell LT5 Pro, or the Antminer L3+. Just make sure to do your research and calculate the profitability of mining Dogecoin before you buy. The profitability of mining can change over time, so it's important to keep an eye on the market.

Mining calculators will help you determine which coins are profitable to mine. If you have a GPU rig then whattomine(already mentioned above) but if you are planning to buy ASIC units to mine altcoins then check this tool asicminervalue.com then edit the power cost with your current electricity cost.

For ASIC, Kaspa is currently the most profitable altcoin to mine with Antminer KS3 units.

About GPU I don't know what coins are currently profitable to mine it seems almost all GPU profits have dropped heavily compared to last year.
It's not worth mining on GPU rigs compared to ASIC miners.

You need to change the priority a little about what you need to know about mining. First, you need to familiarize yourself with the entire mining process, especially the hardware. Once you understand that, then you yourself will know how to check the profitability.
If you already have graphic cards, probably you can get some info on whattomine.com