Watch some of the videos of victor who sometimes posts here.
He plays penhold but modern style so it it pretty much like SH
You can also find training videos by elite lefties like boll or wang chuqin. Also watch their matches to see what strategies they use and then practice those in practice. For example you can use a down the line backhand to provoke a ball into your Wide forehand and then pin him into the BH but that is risky top because you might need to cover a long ground to get to that wide FH.
Also tactics for a lefty against a righty is the same (but reverse of course) as tactics for a righty against a lefty (we are just getting a lot more practice at it
) so search for "strategies against lefties" to get pointers for your own game.
To me as a lower level lefty the game of lefty vs righty is often a fight for the diagonals. Both player want to get into their forehand diagonal (Your FH to their BH) and use strategies to get there.
Thus I find there often is more "action" in a lefty vs righty match-up because you don't have that BH to BH diagonal rally as a "home base" where both players almost cooperate a little because they both have the same goal played in the same diagonal line while left vs right is a fight from ball one. I think because of that many lefties are very offensively minded and looking for shorter rallies.
But take that with a grain of salt, I'm not a very good player.