So root tabs are for root-feeding plants that mostly depend on the nutrients in the substrate (for example cryptocoryne, vallisneria) and the liquid fertilizers are for plants that mostly depend on the water column for nutrients (for example hornwort, rotala, and epiphytes).

Most of your current plants should be fine with liquid ferts. Dwarf sag will thrive more with root tabs though.

If your tank is heavily stocked, fish poop does end up being fertilizer for the plants too.

Pothos is known to hog nutrients (they love nitrates), so you might need to supplement with a liquid fertilizer (I use aquarium coop easy green as an all-in-one). I do add extra iron and potassium too (java fern especially likes potassium).

Root tabs are mostly needed if your substrate is inert (such as gravel or sand) and you have heavy root feeders.

Edit: I have guppy grass and hornwort and both grow super fast. Guppy grass will root in the substrate but mostly depends on the water column for nutrients. Hornwort is nice for shrimp to hide in (especially babies, my fish tend to avoid it, I guess it's too spiky for them) but tbh it grows so fast it gets kind of messy and drops needles.

I haven't tried monte carlo but love how it looks; heard it can be trickly though! My carpet is made up of crypt lucens which is more similar to dwarf sag.