What are ways for a SPC to develop into a good SGT?

Having great mentors and studying is the key. I had exemplary NCO's that guided/counseled me into what I hoped to be a mirror of their character.

Look after your men, back them if they are honest with you. I had a subornate ask if he could call me by my first name, then he ask me what my first name was, I told him Sergeant. Let them know your in charge, and you have their backs.

Great question. Best thing is to understand the roles and responsibilities on a sergeant and for the leadership position in which you will be in once you're promoted if not already serving in a higher position. Be a mentor to not only those you outrank, but also to you peers alike and influence change with those appointed over you. Soldiers need great leaders, so do not become an E5; Become a sergeant as you are already looking to be. Do not be afraid to make a correction or you're excepting substandard actions, as well as know how to follow. Do not think you can't learn something new or follow just because you're an NCO. Everyday we in the NCO must learn and grow in order to set the standard and continue leading from the front well also being mentors to our subordinates., Lastly, no matter what understand issues that go on within your AO and while also enforcing the rules, regulations, procedures, and policies that your chain of command have set for your organization. No matter how much you disagree with something, you can recommend, but you must follow through and never let your subordinates see you disagreeing with something of the CoC that you are telling them to do. You'll make a great Sergeant as I believe anyone on will, as long as you are ready to put in the work, and continue to build on that.

Learn from every form of leadership you encounter, both good and bad. Know the ins and outs of regulations; you can't know everything but you need to know where to start your search for answers. Above all, train yourself to be selfless in abundance. Go the extra mile for your guys every second of the day and be humble about it. It's in those quiet actions that your soldiers will find undying loyalty and respect.

Do your job to the utmost of your ability and training then do it even better. Show your natural leadership abilities. Regardless of MOS, an E-4 is being monitored closely and it would behoove any E-4 looking for SGT stripes to outperform every single E-4 within sight. When one is going to remain in the Army after the first 36 months one should eyes focus on the NCO club pass! No, not really, well, maybe just a little - but do not be satisfied with being just a step below "Buck" Sergeant. I was an acting E-5 for several months and had I not ets'd when I did I am sure I would have been promoted. Do not do like I did, I screwed up and got demoted to E-1 and it took me 60 days to be E-4 back. This all was just a few months before I got out. Back in those days everyone that was not reenlisting and who had 180 days or less remain on the enlistment were released.

Learn how to deal with the hard stuff and how to get there respect , and to get them to perform better than they are a good leader is respected first , and then he loved, rember follow orders and leaded bye example, never fight with a nco about orders in front of troops

Listen to the needs of the soldiers and respectfully try to be a leader don't over step your boundaries with your E/5 and always keep your self squared away lead with good example

lead by example,
learn as much as you can.
get a mentor

Be informed,read all the regulations, be well groomed, seek out more responsibility, become soldier of the month quarter etc. Know yourself and peers and especially your superiors. Do strive each day to do your best, do ask questions about the mission. go to leadership development schools as fast as you can. be proficient in your MOS. ask for help where you need it.

There is not a cookie cutter way to go about this. You need some foundation, to build on. The Army is not about you alone. Find Mentors, find a good network of folks with different skill sets. Educate yourself always. Understand the role of Leaders and Leadership. Build on your strengths gain new tools and improve your weak areas.