You think it's worth the time and money to build a new GPU mining rig dedicated to ETH still?
Well it will be worth it if ETH goes to some crazy number like $1000+ a coin. Just like it was worth it mining back in 2016 because you made like $2/per gpu/per day but if you held till 2018, it would of been more like $200/per gpu/per day.
Remember the KNC Jupiter or Antminer S1 miner, the profits were "meh" when they were released however the people that bought those ASICs made a killing because shortly after BTC went from like $150 to $1100.
Now is it worth mining? Well look at,
https://etherscan.io/chart/hashrate
The hashrate is climbing at pretty high levels, so is the price but the profitability stays mostly flat unless we got those rare days of crazy ETH fees due to DeFI. So might be marginally worth it today, but who knows where the hashrate will be in 3 months or so.
it is a hard call to build a 4-5 k rig.
But if you can get 3x 3080. at 700 each you are at 2100 add 400= 2500 total. and the nvidia 3080 will hold value in case of a crash in mining. downside it is a 280-300mh rig.