See if you can transfer it to another provider. At the end of the day, the expense ratio doesn't really matter so long as the fund does not underperform it's benchmark.
Example 1: Fund A tracks Dow within 0.25%, and charges an annual fee of 0.43%.
Example 2: Fund B tracks Dow within 0.25%, and charges an annual fee of 3.0%.
Example 3: Fund C tracks Dow within 0.9%, and charges an annual fee of 0.1%.
As long as your initial investment keeps track with whichever benchmark/fund/whatever you choose, the expense ratio doesn't really matter.
Check to see, Yahoo finance will work, and compare charts of each fund to the benchmark indices and see how they performed. If they are tracking well, then the expense ratios don't matter. If they aren't, then you're paying for them to buy their new Porsche.
Don't get caught up in the nominal expense ratio. In my made up Fund C, the expense ratio is super low, but it is underperforming.
Concern yourself with performance first, then worry about finding the cheapest option. In any case, your HSA is most useful because you have an automatic return which is your effective tax rate, since you can withdraw them for health expenses and not pay taxes on the amount. So, likely at least 25%, maybe more?