In order for a movement to be successful, you need to have credibility based on a track record. People like to join and support a winning team; especially when they have been beaten down with no hope. The majority of Americans have been trampled underfoot by Communism as they waited for a winning strategy that never happened.
Here is a suggestion for a strategy that I think will be successful against this illegal regime. Whenever a portion of any border wall is to be taken down, go out, lock arms and peacefully refuse to move. This may require some surveillance but I believe there are still good Americans who can provide advance warnings to us within the system. Remember that the goal is to build momentum by setting goals that can be met. When people see success, they will come and you can set higher goals. Never set a goal to high that it will fail. We are in the long game now and the enemy is scared of us.
This may be a simple start but we must do something because submitting to tyranny is not an option. Feel free to offer other suggestions in the comments because resistance is not futile.