I'm ready to buy GPU and forget about my ROI for a long term, my aim is to keep mining coins and hold for long term I don't care about the USD value all I want is lower difficulty and better quantities compare to when mining is still profitable.
I still think it's better to wait until PoS to buy equipment cheaply. Right after the PoS merge, difficulty on the small coins (ETC/RVN/CFX...) will skyrocket as millions of cards try switching to them. These miners will figure out that they're only earning breadcrumbs, which will never compensate for the ridiculous prices they paid for their rigs. Miners will fire sell the cards and go bankrupt, which will drive down difficulty to reasonable levels again. This is exactly what happened in late 2018; the recovery stage took 2-3 months.
This is probably the best time to enter the market if your strategy is to mine & HODL. The cheaper GPUs are, the more rigs you can afford to build, and thus the more coins you can collect.
I predict that the best cards will be the Nvidia GreedForce RTX 3000 series, since they're good at a variety of coins but have decent efficiency. The new RTX 4000 series will be crazy expensive and isn't much more efficient. AMD cards should be a no-go because they perform best on ETH, even though they will crash the most in price.
