Hakone stay for 4 days

I plan to stay in hakone for 4 days, is the pass worth it or is there a pass that will cover for 4 days or should I just shorten my trip to 3 days?

I plan to stay in hakone for 4 days

That seems like a very long time to stay in Hakone. Because most people don't stay that long, a 4-day pass is not offered.

is the pass worth it

You mean two 2-day passes? It fully depends on how much you travel. But transportation around Hakone is generally expensive, so the pass pays off relatively easily.

or is there a pass that will cover for 4 days or should I just shorten my trip to 3 days?

I would consider shortening it to 3 days. Not because there is no 4-day pass, but because I think 1-3 days is enough for Hakone for the average tourist and that there are more interesting places in Japan to spend the additional days.