Do the arithmetic properly once, because it settles most of this and almost nobody does it.
For each category in there, write down what it would cost to replace second-hand, today, in the place you might land. Then compare that against the storage cost for however long you honestly think you will be away — and be honest, because everybody underestimates that number by about half.
When I did it the answer was stark and it was different per category:
Furniture lost badly. Generic sofas, tables, shelving — second-hand replacement was a fraction of what I was paying to store them, and that is before considering that I was paying to keep furniture I would not choose again.
Tools and the bike won easily. Expensive to replace, hold their value, and there is a real cost to rebuilding a tool collection piece by piece over years.
Books were the emotional one and lost on paper. That is a legitimate thing to pay for; it is just worth knowing that is what you are doing.
The useful outcome is not sell-or-keep, it is that you almost certainly want a much smaller unit. Most people are paying to store a small number of things they genuinely want and a large volume of things they will look at in three years and take to a charity shop. Shrinking the unit is available to you today and it does most of the saving.