Why do you think you need extra gears? If you feel you need a lower gear (for hills) then you could probably change your cassette or freewheel for one with more teeth. We managed with a lot less gears in the old days!
I've recently swapped my 11-28 7speed cassette for a 12-32 7 speed. I haven't had to drop on to the 'granny' ring since*.
(chainrings are 22-32-44... it's an old mountain bike).
My only gripe is there seems to be a big difference between my old middle-top gear of 32:11 and the new 32:12... I now feel like I'm spinning a tad in that gear so I'm considering putting an 11 tooth sprocket back on (or maybe even a 10!).
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