The first and easiest change to make your trike more hill-friendly is to replace the crankset with a mountain bike 22/32/44 tooth triple and 150mm length cranks. The 22 teeth low gear will drop your gear inches (GI) to about 14 for 20” rear wheels and 18 for 26”. It is probably not enough - but it is a good start. The shorter cranks will make riding easier, save your knees and, against logic, does not make riding any more work.
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