Because you are on the earth, you can consider yourself as being in orbit around the sun. So you are already quite far down the sun’s gravity well. You may get a bigger time dilation by doing the other direction and leaving the solar system but I lack the know how to figure it out for you.
Also just to let you know, you would only age slowly compared to a person remaining on earth. Time from your perspective would continue to pass at the same rate so you wouldn’t real have ‘gained’ any time.
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