One way to reduce interest charges is using a forex margin loan (sometimes called a carry trade). Your broker may have a much lower interest rate for borrowing in another currency like CHF. Say that is 1.5%. You can take a CHF loan, convert that to USD, and use the funds to invest in US stocks. However, you must now beat both the 1.5% margin interest as well as any forex rate changes. You also have to keep in mind the cost of conversion, which is more favorable to larger sums. For stable currencies like CHF, I've had good results for multi-year timeframes. However, if there is a big drop in USD value to the foreign currency, your loan repayment can be much bigger than you expected. Many people have done this with JPY due to its low interest rate.
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One way to reduce interest charges is using a forex margin loan (sometimes called a carry trade). Your broker may have a much lower interest rate for borrowing in another currency like CHF. Say that is 1.5%. You can take a CHF loan, convert that to USD, and use the funds to invest in US stocks. However, you must now beat both the 1.5% margin interest as well as any forex rate changes. For stable currencies like CHF, I've had good results for multi-year timeframes. However, if there is a big drop in USD value to the foreign currency, your loan repayment can be much bigger than you expected. Many people have done this with JPY due to its low interest rate.
You can use forex futures to lock in an interest rate for the loan. For example, buying a /6S future will offset any currency fluctuation with CHF. However, this adds some complexity.