Thank You for Your Service!
It's good to see you're striving to improve, and by coming here and sharing your experiences and seeking advice proves it.
I have read previous posts, and the one thing that stands out is in every situation, someone is yelling at you. Stop that behavior quickly!
Sometime, we have to keep coaches in the game so we can educate them, not only for ourselves, but for the next guy. Not to mention, a lot of these coaches move up as their child does, at least in my area, so you're likely to see them for years to come. We have to be more professional than them. We have to gain their respect. Ejecting them doesn't get respect, it just gets you scratched
A couple thing to share. Well, a few.
Appearance! Shoes cleaned, shirt and pants pressed, hat cleaned and pleated , ball bags too is a start.
I once went to do a game out of town, AAAA school, nice stadium, I had the dish. At the end of the plate meeting, I asked if there were any questions? One of the coaches replied, " not today, you look like you know what you're doing and I plan on sticking around".
Positioning and crisp mechanics! Long fly ball down 3BL, get down there! Normally the manager is coaching third and has a better view of it. Once had the coaches son hit a shot that was definitely going over, only question was if it was fair/foul. Before he could turn around and plead his case it was fair, "FOUL"! He said, "You scared the SH*# out of me! You're the only umpire I've seen make it this far. (with a smile) Good call". I asked, "about a foot"? He replied, "ten inches".
Don't yell back! Well, try not to. If you do, don't be justifiable. "Not today coach". "Time! You have something you wanna say to me coach come and talk to me, but you're not gonna yell at me from 90' away"! Sometimes it works for both sides because the other coach hears that you're not going to tolerate that behavior, as well as the players and fans. There is also the line up card technique. There is also a lot of time during the game you can have a little 1 on 1 time. I prefer " The Look".
Don't have rabbit ears! What you can't hear can't offend you. Run away when you can and get back in position. Especially after a close call at the end of an inning. The coach may want to question it but he sees you running into RT CF, he may just abandon his efforts!
As I understand it, you're doing games solo. Be in control but not controlling. "Coach, in my judgement..." Is a useful tool. They seem to understand their next words can have consequences.
An assistant coach was coaching 1st as they usually do. The first banger of the game, of course, he jumps up yelling and signaling safe! "OUT" was my reply, along with, "Coach, if you're not going to make any OUT calls today, please don't make any SAFE ones". He smiled and nodded his head. On the next banger, I looked at him, he looked at me with his eyes wide open holding his breath trying to restrain from his usual antics. There was a disturbing pause as I pointed to him to make the call, "OUT" he said. I confirmed his call. Everyone in the ballpark laughed. One more coach I never had to worry about.
This is coming from a guy who once dumped 3 coaches in 40 seconds. They deserved it but I also wanted to show I wasn't gonna tolerate their SH*#. I was the new guy in town and still here. They, on the other hand, were replaced the next season. Sometime they have to go. Make sure they deserve it.
Disclaimer: Some things mentioned may not work for everyone.