Well, this was a train wreck from start to finish.

5.o14 looks better for starters. I think everything after that was just scrambling.

Yes.

You should also look on the other side for something like |5.h15. Blocking distance to m14, but not blocking to j10. So this opens up a White threat at h10 (6.k13 7.h10 8.f10 9.j11 10.h9 11.k9) and another threat to cut through at k13 (6.h11 7.k13). It's also a pretty good spot for reaching the bottom: 6.i19 7.e18 or 6.h19 7.k18.

That's good advice. Noting how the presence of n10 means that 5.h15 can be a little closer to the left and still be a viable threat for going right. Thank you!!

All of Alan's lines are correct as far as I can tell. But black might try some tricks. For example after |5.h15 6.h11 7.k13 8.j12 9.m12 is probably a mistake by white. One line is 10.k14 11.m16 12.l16 13.n14 14.n17 15.q17 (this 3-0 block is a defensive pattern which often works, but not here because white does not have enough room) 16.p18 17.s16 18.r19 19.v19 20.t19 21.t20 22.s21 23.u17 24.u22 or 15.r16 16.p15 17.q14 18.r6 19.p11 20.m8 21.m7 22.l6 23.o8 24.n5 or 19.m8 20.q13 21.r12 22.r11 23.s10 24.q9 Another try is 11.n16 12.m15 13.o14 14.p7 15.p9 16.q9 17.r10 18.l6 and maybe white can win but this is all more complicated than it needed to be. Instead 9.o12 threatens white Q17 or L15. If 10.n12 11.p14.