Training your strategy and tactics without having access to a fencing club can be difficult. There's simply no substitute for bouting, and private coaching sessions. That being said there are ways that you can stay sharp.

Watch and analyze fencing videos:

There are tons of fencing videos online and some excellent analysis. I reccomend you look at some of these resources:

• https://www.youtube.com/user/CyrusofChaos Andrew Fischl (Cyrus of Chaos) is a top level US Saber Fencer provides a great selection of videos and bout analysis.
• https://www.youtube.com/channel/UCzIyPbTBgNZSYgnal1_tqkQ Cyranos Place has some fantastic technical and tactical videos
• https://www.youtube.com/user/sydneysabrecentre This is a fantastic saber resource for bout analysis and training
• https://theengrd.com/ Engrd is a web resource for fencing with paid and free content curated by US Fencer Race Imboden
• https://www.youtube.com/user/sicardable Michel Sicard is a legendary epee coach that has shared his coaching sessions with the world

Shadow fencing:

There are a couple excellent methods to practice visualization in fencing.

• After watching a fencing video of your favorite fencer visualize the action and try to imitate it. Imagine the opponent in front of you and try to do the same action as  your favorite fencer
• Remember a tough bout or opponent and imagine them in front of you again, and think about what you could do to change the outcome of that action.