Isaac is a champion discus thrower; he holds the state record. (This is
an acceptable use of the semicolon.)
Isaac is a champion discus thrower; his dad is a baker. (This is an
unacceptable use of the semicolon.)
The concert was not just good; it was fantastic! (This is acceptable.)

accordingly	in other words
as a result	indeed
besides	instead
consequently	meanwhile
for example	moreover
for instance	nevertheless
furthermore	otherwise
however	that is
in fact	therefore

The new tools are great; besides, they were perfect gifts for Dad.
Your dance score was one of the highest in this early competition;
consequently, you will now move on to the next round.

This movie’s special people include Missy Swit, lead; Kate Lewis, director;
Morty Mulis, producer; and Freida Ling, cinematographer.

At the beach we collected shells, wood, and seaweed; and then we
barbequed, walked the shore, and made a campfire.