I currently have a lvl 10 WF fighter and he is ready to go to lvl 11, questions are this

1. Do I multi-class and go Barb or Pally

2. I think i need more AC currently 32 w/ +4 shield. How do I get better?

3. HP's are at 207, is that enough?

4. I feel I need more attack damage. How?

Currently stats are this
STR 25
DEX 14
CON 18
INT 10
WIS 11
CHA 6

I'm sure all enhancemets known would help, but lack of time and I can look up later. Thanks