If you want to create a simple 60% (equities) and 40% (bonds) portfolio, you can utilize a combination of leveraged ETFs. For example, [NTSX](https://www.wisdomtree.com/us/products/capital-efficient/ntsx) is a fund that makes a 60/40 US equities/bonds portfolio and leverages to 90/60. You could put all money into this, but it does not include international equities. To include international, you could add [NTSI](https://www.wisdomtree.com/us/products/capital-efficient/ntsi) according to a global market cap weighting (say 65% US, 35% international).
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[This backtest](https://testfol.io/?s=dxAgYnMRZqk) shows a comparison. You can see a baseline 60/40 portfolio performance of 9% and how it compares to the others:
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[This backtest](https://testfol.io/?s=1r93I34f89R) shows a comparison. You can see a baseline 60/40 portfolio performance of 9% and how it compares to the others: