Hi xineohpinakc, Sounds devastating, but it may be saved if we can diagnose some symptons or you can show us some pictures. Here follows a cut and paste of mine from another hibiscus site I contribute to, describing that your plant may be suffering from Phytophera. You will read that it also refers to plants in ground, though majority of info applies to both in pot and in ground:
Phytophera as I know it is a disease of the outer
layer of bark, ie the thick whitish layer between the
centre hard wood and the brownish outside of the
branch / trunk - it is known as the cambium layer. It
is a soil borne disease, from a common fungal organism
present in most soils, but prone to proliferate in wet
conditions and happy to take advantage of certain
situations where a plant is under stress for some
reason. Specifically I have found that stress to be
in situations where you expose your plant to excesses
of water, most often when combined with coldness or
where you may have overfertilized a plant or where a
plant goes from very dry conditions to very wet
conditions and cannot use the extra water because of a
lack of food to stimulate growth or where you will
have pruned your plant well and you overwater it / it
rains for days on end. In all these cases, some of
the roots are prone to damage and phytophera seems to
get in.

The disease can become evident anywhere on a bush, but
in my experiences, it firstly shows up on branches.

You do not see drooping of the leaves with phytophera.

(Where drooping of the leaves cannot be corrected by
watering, it is probably another type of fungal
disease).

Potted plants are more quickly diagnosed than ground
grown as you can see the wetness of the mix. This is a
general guide to follow and is a progressive disease
that takes time to show development of all of the
symptoms:
 You may notice that certain plants have changed
their water needs and are not dryi

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