Invest in DeFI, Or literally any good project. You'll never make your 6K back in time if you're just starting now. GPU, PSU, and other Hardware prices are through the roof. During Bullmarkets you DO NOT BUILD mining rigs. You buy the coin which will make you'll more money in a month than a mining rig will paying itself back. That's my personal opinion. I'm a big miner, but I started during the first bullmarket in 2017 and never stopped even during the bear market of 2018-20.
With ETH finally getting Phase 0 and moving to phase 1.5 in 2021/22 Personally the mining game's over now. On top of that ASIC on ETH that are insanely powerful are coming online this year.
Here we are again, people are packing 40 pieces of graphic cards right in front of me in a store to mine Ethereum and you are here saying you can't make your ROI back? It only takes 4 month to get ROI back on a single gtx1660 super today, since you said you build your rig in 2017? Good, my question is did you make back your ROI or NoT?
Here we are again. People thinking of buying over-inflated priced GPUs like the 1660s when ETH POS was initially launched last year with a full move away from PoW thinking they'll make all their money back GPU-mining. I'm going to put this super easy.
$400, 1660 SUPER(MSRP was 230~)( plus you can't even buy these anymore there not in production). Will make about $1 - $1.50~ a day(accounting for a full system setup at 200w with a single 1660s@30mh/s, 2.5 ETH BR). That's a 400 day ROI. We're in a Bullmarket, Bull markets don't last. This is the third Crypto bull market I've been in. If you/he puts that in a good project he'll easily make $100-200 in just a couple of months.
Did I ROI?
Yes, and well beyond it now. However, As I said I mined during the bear market and suffered a lot of set-backs and pain. The Black-swan flash crash of 2018 and then in 2020 basically wiped me TWICE. In 2020 I just about gave up on everything but I worked at my normal job and held, kept mining. Last year I purchase 588's for around $65 a piece on Auction from liquated mining farms.
So my question WHAT ARE YOU going to do when your mining AT A LOSS because a 'flash-crash' or markets tanks for sometimes months on end? I saw it at the end of 2018. I'll probably see it again at the end of 2021.
Gtx 1660 super has 6gb VRAM, before that 6gb VRAM runs out it will take 3 to 4 years, you are bewitched if you failed to get your ROI back in this period of time even if you can only get 0.80$ from gtx1660 super mining 24 hours a day, what about those asics that are only given access to 4.5gb memory?? Before that time comes you should have get 2x your ROI or even 3x, do some math