Since you have 7K USDT you can invest in Bitcoin. If you keep your 7k USD Bitcoin invested you will get a huge return if the Bitcoin market halves. If you trade with $7K to get $30 a day, you might get more than $30, but you may lose from trading day after day because of the ups and downs of the market. Trading may not pay you $30 per day so your best bet is to invest in Bitcoin and hold until the Bitcoin market is halved.