upgrade advice needed

Hi all,

I recently started cycling and bought myself an second hand Orbea Inox with the original Shimano rs20 wheels.
It has the original Shimano 105 setup (12-25 cassette) but the crank set was upgraded to ultegra 52-39.

Now, I moved to Scotland where things are a bit hillier than back in France where I bought it. I find myself struggling in the long and steep hills.
More training will surely help but is there anything I should consider upgrading/modifying on the bike to make my climbs easier?
Low budget...

Thanks everyone

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