The club has €150,000 in free reserves. How to invest safely, without risk?

Hello, we are a small non-profit youth work organization and finance ourselves through grants. There is currently around €150,000 in the account, currently as daily money at the savings bank at 0.4%. With inflation we lose real money. These are free reserves, not earmarked funds. The money can stay there for a while, but it shouldn't be locked away for decades. If in doubt, we want to get to it. What it's not about: returns or big profits. We want