For day trading you need a broker who does not eat your profits in the name of conversion and commission. IG is the worst.
with falling USD there is no point in dealing with shares for IG. Example
1) Bought SPOT 50 shares at $253
1) 2 hours later sold SPOT at $256.
Return -£25 (yes negative)
They say they don't charge commissions but their conversion rates are so different for buy and sell that you are just donating them your research, hardwork and profit.
Did the same experiment with DEGIRO ended up with £100+.