I flew gliders fot the last two years of university as I could not afford my PPL yet but that was only during the season, April-August, and still, there were months were I could not fly at all. Managed to rack around 50 hours of which 35 solo.
One thing you might be able to do that I could not have done at the time is tow gliders. In fact the pilots are usually club members. That could be one way of maintaining your handling skills for free.