Here's the cheapest train ride I can think of that's to the South of you:
• Depart Orlando any Saturday at 10:20am on the Southbound Silver Star and get to Winter Haven 3hrs15min later 1:35pm.
• Fiddle around in the train station for about 2hr 15min until 3:48pm and then....
• Depart Winter Haven at 3:48pm on the Northbound Silver Star and get back to Orlando 3hr 28min later at 7:16pm that same Saturday
This one's not very exciting because it involves a round trip on the same train over the same routes, so the only variety is try for a seat on the opposite side of the tracks on the way back. But it's only $36.
Going North it's possible to travel different routes on about half the trip by going up to Rocky Mount, North Carolina on the Silver Star, getting off the train there at 10:03am then heading South on the Silver Meteor 13hr 47min later departing Rocky Mount at <gulp> 11:50pm! Note I said possible. But I've no idea what you'd do in Rocky Mount to kill the 14 hours between trains and that departure time just before midnight isn't too great.
A better trip to the North over different routes (different trains) involves an overnight stay in Washington D.C. With the Covid schedule, this overnight stay in WAS allows the selection either Silver up to WAS and the other Silver for the trip back home. The two possibilities are:
• Depart Orlando any Wednesday at 1:35pm on the Northbound Silver Meteor and get to Washington D.C. 17hr 37min later at 7:07am on Thursday
• Spend the night in Washington D.C. and then...
• Depart Washington D.C. Friday at 3:05pm on the Southbound Silver Star and get to Orlando 19hr 1min later at 10:06am on Saturday
Or
• Depart Orlando any Saturday at 7:32pm on the Northbound Silver Star and get to Washington D.C. 19hrs 6min later at 2:38pm on Sunday
• Spend the night in Washington D.C. and then...
• Depart Washington D.C. Monday at7:25pm on the Southbound Silver Meteor and get to Orlando 17hrs 24min later at 12:49pm on Tuesday
Coach tickets for the two of you for either of these trips to WAS and back would be $444 or 19,738 points.