You’re in a losing position no matter what you do but…
Spilt? Seems terrible, you turn 1 losing hand into 2 losing hands most likely. With a high count you are even more likely to just get 10s and lose 2x the original bet.
Stay? Very unlikely to win, again the high true count hurts you.
Hit and hope you pull a 4, 5, 6, or 7? Seems like the obvious best answer. And of course follows basic strategy. The positive count doesn’t change the answer in this case.