Well, you have one big step up compared to other miners. Not having to spend money on electricity will make you more profitable in mining, that's for sure. However, you are starting too late, meaning you face a very high GPU price, it is a minus point
GPUs are overpricing for their value, so it's not wise to buy a GPU right now, as it will take a long time to get that money back. You have to consider whether it's really worth buying a GPU right now. I have a couple of guys who are miners, he says we shouldn't buy GPUs now, it's too expensive.
However, it is just my suggestion, you should think carefully about this. Because if you do nothing, it means you get nothing. Choose the right time to buy a GPU, not now. Your power supply is there even if you're not tapping, so just wait