I've been thinking a good bit about gender-neutral language lately, and I've been making an effort to eliminate unnecessarily gendered language from my day-to-day speech. However, there are a few sticking points for me that I am having a hard time with finding my way around. One of the most difficult for me, having been brought up in the deep south and still living there, are honorifics like "sir" and "ma'am". I use these when addressing pretty much anyone, and it's a habit I'm having a hard time breaking. It's got me thinking about whether there are any good alternatives that would feel respectful of the person I'm addressing while not sticking out too much. If that's not an option (and I suspect it would be asking too much) then what are your ideal alternatives, either neologisms, borrowed from other languages, or just repurposed words that are in current use?

Examples of usage that I would love to replace:
"Yes, sir/No, ma'am"
"Excuse me, sir/ma'am"
"Mr./Mrs./Ms." (I use this less often but still catch myself at times. I also think this one has the best alternative currently in use, with Mx. catching on in some places)

Also, if this question is missing the mark or disrespectful in any way, please let me know. I'm still learning!

Shortly after my son was born I started calling him "Buddy." I love it and he answers to it like a name now. My daughter is two and she calls him Buddy, which I think is the most adorable thing ever.

I'd like to do this with my daughter, but I'm not really a fan of things like "honey" or "sweetheart," though I do wind up calling her sweetheart pretty frequently.

Buddy is like friend, which is what I'm going for, but that's taken already. What else could I use?

A series of gender neutral alternatives for the third person singular pronouns (he/she/it) have been proposed throughout the recent years (and maybe decades). I wonder the preferences of fellow users here in that regard. So I'd be glad if you could answer the questions in the title, and maybe elaborate a bit on the reasons of your preference. I'm both interested in this generally, and it could be useful as a means to help me practice quantitative linguistic variation (obviously this would hardly be scientifically usable source of data for actual real research so I'm not asking this for that purposes). I'll add my preference as a comment.