You know it's been Winter, right? That plants grow according to seasons. Plants don't usually put on new growth like you're describing during the winter. The opposite is true, their growth slows down or seemingly even stops.

Now, that Spring just started, my Hoya plants are putting out new leaves, slowly to start, but they're doing it.

Pls allow more time & be patient, you could read up on Growing Seasons.

Repotting is done when plants need it, like when they outgrow their current pots. Not to make something happen, plants just don't work like that.

Hi, Vita. A definite growth stopper, root congestion begins to be limiting somewhere near the point in time when the root/soil mass can be lifted from the pot intact; so, if your plant has congested roots, it would definitely benefit from a repot, which is more involved than just potting up. Repotting includes root pruning and a complete change of soil, where potting up is essentially moving the existing congested root mass to a larger pot and filling in any voids with fresh medium. Cutting away some of the roots on the outside of the root mass, particularly at the bottom, can me marginally effective, but provides no where near the rejuvenation that occurs when a grower chooses a full repot as a remedy to root congestion.

That said, the plant goes through a yearlong growth cycle that has an annual 'sweet spot' that lasts about a month. In the northern hemisphere, the plant's state of vitality usually peaks sometime in July; this, because it will have regained some of the reserve energy it would have expended to get through the dark days of winter, and it's current ability to make food (plants make their own food during the photosynthetic process - fertilizer isn't plant food) will be peaking due to the longer days and more intense light. It's better to work with the plant's natural cycles that at cross purposes with them. The plant will show it's appreciation and you'll know you're a better nurturer for taking advantage of the plant's strengths and making allowances for when it's not as able to recover quickly, which leaves it more susceptible to diseases and insect predation.

I have at least 30 ficus covering more than a dozen species, and I try to repot all that need repotting as close to the summer solstice as possible. No trees like or prefer congested roots, but for Ficus, it's not an emergency that requires immediate remediation. You could use the time between now and summer to put together a care regimen that would culminate in repotting in the summer - assuming you live in the N hemisphere and not particularly close to the equator. The closer to the equator you are, the less variation there will be in the plant's vitality during the growth cycle, so the less important timing is. I have no idea how interested you are in putting a plan together - let me know if you'd like to learn more.

Al