You are as clueless about Covid as you are about baseball.
1. Babe Ruth would benefit from modern nutrition and conditioning. He didn’t seem to have much of either in the 1920’s.
2. Ruth would be encouraged to cut back on the drinking, cigars and partying. If he failed, he’d likely be out of baseball. If he succeeded, he’d be a better player.
3. Ruth used a 40-ounce bat in 1927. He used a 46-oz bat to hit the first homer in Yankee stadium. Mo Vaughn used a 36-oz bat, and most players today use a 32-oz bat. If he were alive today, he would use a light bat as players do today to compensate for the modern pitchers' heat.
4. Ruth lived during the dead ball era, despite that he still hit moonshots. If he was in his prime today, no doubt he would be hitting drives just as far as Judge or Stanton. Ruth was 6'2" and around 220-240lbs, so he had the size & strength all along. Plus with his outsized personality, he would have been a modern media sensation (think Peyton Manning, Michael Jordan level) the king of endorsements,/TV commercials all year round.