Some One

Hi, I'm using my crypto as collateral to borrow a specific token which I expect to go down in price over time. Once it's gone down I can repurchase the token for cheaper and an get my collateral back and have more of the collateral than I started with. For example. Example: - I have 1 ETH and expect ETH to go up in price. - I borrow $1500 USDT with my 1 ETH as collateral. This is 1 ETH is locked until I repay the loan of $1500 USDT + interest - With the $1500 USDT i then buy 0.5 ETH. In a few months price of ETH has gone up to $6000. - I sell 0.25 ETH for $1500 - I repay the $1500 loan - I get my collateral of 1 ETH I now have 1.25 ETH (0.25 ETH more than I started with). I didn't factor in interest in here to keep the example simple. How is this considred when submitting taxes. To now I have considered the 0.25 ETH as income and taxing it accordingly on my self assessment. Is that correct?