Is QQQM a suitable long term investment?

I don't think there's a risk in its future just because it's a recently released ETF. QQQM is just a smaller version of QQQ, with a lower share price and lower expense ratio. As such, if you think QQQ is a good investment, QQQM should be equally good if not better for your long term investment needs. Personally, I'm a big fan of QQQ so QQQM would also tick all my boxes.

However, do remember to diverisfy as QQQ/QQQM is much more concentrated than the S&P 500 and is more tech heavy as well.