Toujeo is a concentrated (3x) long acting insulin, a version of lantus. (Edited to add, 3 times stronger than lantus, but the active ingredient is the same glargine.)
Toujeo® Max Solostar® is a 900 Unit pen with concentrated insulin, that can fit up to 3X more insulin in the same-size standard pen, which may mean fewer pens, injections, refills, and co-pays. See Important Safety Information.
www.toujeo.com
The trouble with moving onto insulin is that you have no idea what initial dose you need so the dose has to start low and gradually be increased. My guess (and I stress that this is a guess) is that your DN is waiting till your levels to stabilise at whatever level she is aiming for, before she reduces the review frequency.
Good luck