Invest some in altcoins. (some top 10/25 coins + some low market share coins) Look for rising difficulty/hashrate +increasing trading caps at exchanges)
+ buy few rigs
If you need to buy a GPU buy 1080ti. Buy the best reliable COOL card.
Less systems to upkeep. (They will HAVE problems!!) Only "problem"" is resale value of 1080 ti with Volta coming out (unclear when). Value Might drop to 300-400 range Used.
I think a lot will depend upon when AMD will drop prices of their failed Vega GPU.
Happy mining
I already investing in some altcoins during a year.
I already have 4 rigs with 1070
and 2 rigs with 1080ti
and 1 rig with 1060 6gb
and im still not sure what should i buy now
1060 or 1070 or 1080 1080ti
if you look at the 1080 and 1070 the difference between the price is only 60$
but profit is between mining zec on 1080 and 1070 is 28%
but the difference between cost for 1 GPU between 1070 and 1080 is 10%
So maybe 1080 is the best choice here?