This is something I struggle with myself. And I think every new investor in an equity fund also struggles with this too at some point.

And someone asked me about this in the comment section. And I've read this in forums too. What if I sell my UITF/MF when it reaches a high and then buy back when it falls to a low? Is this a good strategy?

Yes, that's a profitable strategy; but it really depends on your execution.
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