Didcot Town have been relegated from the Zamaretto League Premier Division after losing 3-0 at home to local rivals Oxford City on Monday.
The Railwaymen had to win their last game to secure safety at the expense of Weymouth, who finished two points above them after losing 3-2 at Truro City.
Didcot boss Ady Williams told BBC Oxford: "It was in our hands. The lads are really down and dejected.
"But you have to learn from these experiences and grow stronger."
Didcot have lost 22 of their 44 games this season and after two years in the Southern League top flight they will now join local rivals North Leigh and Abingdon United in the Divison One South & West.
Williams, who replaced Stuart Peace as Didcot boss in January, admits he is not ready to make a decision over his future at the club.
"I just spoke to the chairman [John Bailey] and as you can imagine there are a lot of emotions running high at the moment so let's just take stock," he said.
"I'm sure the chairman and I will have a chat and hopefully sort something out for next season.
"But I always feel that after a day like today, you've got to walk away and let things settle otherwise you can say things in the heat of the moment."