60 cards is quite an investment that you've made.
As I see it, there are two types of miners.
TYPE 1: Mines coins based not on what the coin is worth currently, but mines coins based on the change that coin may increase in value at a later time.
TYPE 2: Mines the most profitable coin at that time.
It sounds like you are a type 2 miner.
Based on that, I might consider beginning to sell off some cards and here's why
1. Nvidia will release new cards this year. I expect the next generation of Nvidia cards to be better at mining ETH than they are now. AMD is supreme in the ETH mining market, this is why I think Nvidia will seek to make improvements there. If you are going to continue to mine ETH, I might consider starting to sell some cards off now slowly. Get some liquid fiat to buy the next gen cards.
2. if you believe #1, then you should also think AMD cards will drop in value after the new Nvidia releases.
Your other option is to begin mining other coins. Most coins RIGHT NOW wont make you as much daily income as ETH. However, some of those coins may make you MORE than mining ETH - IF you mind and HODL.
If you can mine and HODL , there are many opportunities out there. I've always felt this is where the real mining profits are. However, if you must spend your mining profits monthly, this wont work for you.
Type 2 miner here, I think type 1 miners haven't got a clue. Why would you mine coins with minimum profits? When you can mine the most profitable coin and with the most profits buy the coins that type 1 miners mine, and then hold or do whatever with them.
As a type 1 miner you're basically wasting electric/profits/time to get something.
As a type 2 miner you're paying your electric and your profits can be used to purchased way more coins of your choosing than if you were a type 1 miner, you're also using less electric and time to get those coins, that you think might rise in value sometime in the future.
Another example: Type 1 miner uses 3kw to gain coins valued at $30 per day. Type 2 miner uses 3kw to gain coins at $50 per day. Electric costs for both are $10 per day. Type 2 miner spends $20 of his $40 profits on what Type 1 miner is mining.
Type 1 miner sees this and