Yeah, at this point it's better to buy Bitcoin and wait, if you want to build a solar mining farm and still buy Asic miner it's going to cost a lot.

Buy a BTC at 16k and wait, if BTC goes back to 59-69k again then you will have enough to build yourself a mining farm with solar panels.

I have successfully build my own solar farm in 2021 but for GPU mining and now all I need is an Asic miner.