Williams, who joined Fulham on loan in January, has been linked with an Anfield exit this summer to get more regular game-time with Trent Alexander-Arnold blocking his path to the Liverpool first-team.
But the Wales full-back, who signed a five-year Liverpool contract in 2020, says he will be returning to Anfield a better player following Fulham’s return to the top flight.
“It’s been a great loan,” said 21-year-old Williams, a Premier League title winner with Liverpool in 2020, at a McDonald’s Fun Football session.
“But I’ll be going back to Liverpool in the summer, feeling like a more mature player and definitely an improved player.
“Right now, I just want to play football week in and week out.
“I want to play as much as possible and gain as much experience as possible, and so far it has definitely helped me.
“I’ve improved as a player and getting promoted is a nice one to put on the CV.”
Victory would take them to 90 points and second-placed Bournemouth would be unable to reach that tally by dropping points at Swansea.
On winning promotion, Williams said: “First and foremost, it’s that experience of winning with a great group of players, which is hard to replicate.
“I’ve won the Premier League and hopefully I can go on to win the Championship now. I have gained a lot of experience in a short amount of time.
“I’ve gone from starting a Champions League game against AC Milan and beating them 2-1 to playing Barnsley.
“So I have gained quite a lot of valuable and varied experience at such a young age.
“I want to be a Premier League player. For me, I think it’s the best and the toughest league in the world.
“And you always want to be playing against the best players in the world.”
Williams could end the season by helping Wales reach only their second-ever World Cup, and their first since 1958.
Wales will play either Scotland or Ukraine in Cardiff on June 5 to decide a place at the finals in Qatar later this year.
Williams said: “It means absolutely everything to play for the badge on the shirt. Every time you step out onto the pitch in that shirt is exciting.
“I’ve always dreamt of playing at a World Cup since I was little, and you don’t realise how hard it is to get there.
“We’ve never been so close before in our lives. We are going to give everything we can to get there.
“Playing at the World Cup will be a huge boost to the whole Welsh nation and will hopefully inspire others to get playing.”