Have you made any kind of point in your above post? Maybe? Let me attempt to parse your various points, and try to figure out if you might not be a bot, yourself.. hahahahhaha 
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What difference would this make? Trying to avoid tax ramifications? Why would it matter if you are using USDT or USD, otherwise? Either an exchange uses USD or USDT, but they might not even disclose what they are using, so does it matter, in the whole scheme of things?
Of course, if you are considering exchange fees and also tax ramifications, then you do have to account for each of your costs in order to ensure that each of your trades are sufficiently profitable to cover your costs.
Maybe I take the most issue with any kind of claim that the market is stagnant? but I think that any claim that it is difficult to predict, then that status is the exact opposite of stagnant... so you seem to be asserting that the market is stagnant and it is not stagnant or that the market is currently stagnant, but it has the potential to become not stagnant at any moment...
Either interpretation of your statement makes little sense, especially if we look at actual facts, and I would hardly characterize the current market as stagnant. Look at the current BTC market. You have a price of $9,949 on May 5, and then a price of $7,267 on May 23.. which is about a 27% price drop, and then you have a price of $8,579 on May 21.. which also would have been a 15% price drop down to $7,267. In what fantasy world would those price moves be considered "stagnant?"
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There is no "best" because you do not know the future at the time that you set your orders, but you can calculate a place to make yourself comfortable based on your situation and your views..
To the extent that this above statement makes any sense, it might be your most accurate point, and that is to make a plan that works for you; however, there is no best plan, even though there may be plans that are more in touch with actual probabilities as opposed to plans that merely seem to be stab in the dark gamblings.
. I think that if you were to start a trade then this time you should buy bitcoin and trade only on the USDT pairs,
What difference would this make? Trying to avoid tax ramifications? Why would it matter if you are using USDT or USD, otherwise? Either an exchange uses USD or USDT, but they might not even disclose what they are using, so does it matter, in the whole scheme of things?
Of course, if you are considering exchange fees and also tax ramifications, then you do have to account for each of your costs in order to ensure that each of your trades are sufficiently profitable to cover your costs.
the market is stagnant and difficult to predict,
Maybe I take the most issue with any kind of claim that the market is stagnant? but I think that any claim that it is difficult to predict, then that status is the exact opposite of stagnant... so you seem to be asserting that the market is stagnant and it is not stagnant or that the market is currently stagnant, but it has the potential to become not stagnant at any moment...
Either interpretation of your statement makes little sense, especially if we look at actual facts, and I would hardly characterize the current market as stagnant. Look at the current BTC market. You have a price of $9,949 on May 5, and then a price of $7,267 on May 23.. which is about a 27% price drop, and then you have a price of $8,579 on May 21.. which also would have been a 15% price drop down to $7,267. In what fantasy world would those price moves be considered "stagnant?"
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so trading day will be the Choose the best at the moment.
There is no "best" because you do not know the future at the time that you set your orders, but you can calculate a place to make yourself comfortable based on your situation and your views..
Always have a specific business plan and follow it to be able to lose profitability safely and minimize risk.
To the extent that this above statement makes any sense, it might be your most accurate point, and that is to make a plan that works for you; however, there is no best plan, even though there may be plans that are more in touch with actual probabilities as opposed to plans that merely seem to be stab in the dark gamblings.