They do all broadly mean to go (floating may or may not infer movement) but they are much more descriptive verbs. To wander means moving with no destination but with some degree of effort so a person wandering around town is likely walking around without any particular direction. To float means to be carried around on another surface, which may or may not involve movement depending on the movement of the other surface. There is no effort by the person/thing floating. In your example 2. The person is literally making no effort To drift means moving in response to another force. It suggests the person/thing could resist the direction being applied but it's easier to go along with the flow of power. In your example 1. The person is drifting/moving from job to job in response to whatever becomes available without choosing or actively pursuing a career direction. The outside force moving them is the job opportunities that become available

"To drift" means that he is not trying to choose a direction. For example, "The boat had no sails and the engine was not functioning. It drifted wherever the ocean pushed it." "To wander" means that he might not have a destination, but he can still move with a sense of purpose. For example, "The explorer wandered through the forests on the big mountain. He examined each interesting thing that he saw on his journey." "Float" in this context can mean "not trying to move in any direction, but also not trying to drown." So perhaps he does not know where he wants to go, but he is using enough energy to keep his head above water, so that he will survive while he waits to decide where he wants to go. These are "metaphorical" interpretations, but I think you will understand. Good luck!

Drift is when something moves away from its position. e.g. The boat lost its anchor and drifted away. Floating is to be on top of something because you are lighter than it. e.g. The boat filled with water and no longer floats. Wandering is to move without purpose. e.g. We caught enough fish, so we wandered around the islands until we had to return the boat to the harbour.

as far as i know, they have different meanings, and they are used in these 3 sentences as expressions, for "drifting" it is usually used for sliding or side moving, for floating, it's usually related to water e.g. wood floats on water , for wandering, it is like moving without a target destination, hope that will help, and hope that it's right :))