here is my opinion…
since you’re still c2 sword c2 barb c2 …go for barb C3 then Fencer…
as what @sparklinglennard said you will have great DPS and good synergy with Shinobi…plus you have all the access to damage types: Slash, Pierce, and Strike. Plus you got 2 reliable stun skills which are scary.
The only downside to this is Rapier has the lowest durability in entire weaponry. So, you need to bring extra rapier and repair them constantly.
And also, this is non-auto attack reliant build path. It’s more on skill. The more skill you use, the SP you will spend. Since Swordsman has low SP Pool, it’s really a bad thing to consider. However, Fear not… you got SP potions…so…relax
Also good at PvE and PvP by the way