I've only been back into mining for about a month or so.
Got in late after litecoin, too.
Stopped mining when it was no longer "profitable", in 2014 or so, and sold off my rigs.
Still managed to double/triple my original investment over time, and only doubled because I was stupid enough to stop following markets, (losing lots of shitcoins due to delistings, when I could have sold them for small fortunes - bad so much eac and xsi 😪).
I basically had given up.
So here's what I think after the last BTC rally.
I am ignoring current profitability and ROI calcs.
What I care about is how much hardware I can have up and running to accumulate cryptos I either genuinely believe in or that I believe will pump eventually.
I am basing my profit projections on how much my BTC will be worth when one BTC will cost 10, 20, 30, 100k, years and years from now. Block chain and cryptos are here to stay, and they will grow into a monster. We haven't seen anything yet.
This is a marathon, not a sprint.
At this stage It's far too speculative to invest in unless you stand to lose the money you put into your hardware.
But if you wait long enough, you will make money.
every now and then another crypto will pop up that will even show you day to day gains, Like ltc once did, like eth and others are showing now, but as far as I see it, that's only good because it lets me buy more equipment and set aside for power costs when times get rough.

ANd until the next rally, I will be buying all of the equipment being dumped by the shaky newbs (like I did last time!)