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Brendan is right,try to get up there and try different eyepieces and barlows.
I found with the ETX 125, Meade’s own 9.7mm was a useful eyepiece. I also used a Revelation 2x barlow. Don’t forget that the more magification you use the less light you gather and so image quality is lost.
The ETX is best used with low power as the images are sharp. Hope this helps.