Retainer Venture Question

[Parawill]

For your actual situation, your retainer needs to meet the required gathering stat. Basically you need to give your retainer better gear.

Both retainers are maxed out at 25 for their assigned job. How do I break their cap?

You need to actually level your own gathering classes before you can max out your retainer's Botanist, Miner or Fisher level. So if you ever want a level 50 Botanist Retainer, you need to have your own Botany level at 50.

[Alice_89th]

Like Amnesia mentioned you need to raise your gathering stat.
As gathering isn't a stat that you gain naturally you will have to equip your retainer with gear that has this attribute.

The requirements on lower exploration ventures are not that high, so most of the time you can easily get the amount of gathering needed by equipping your retainer with both a main and off-hand tool close to their level.

As for the level cap, like Parawill mentions you will need level your own botanist first.