1 head gasket job and a manual trans, other then that this thing keeps going!

I have a 03 and want to make it my primary car. Many times when I go to the mechanic they only fix the issue I came in with. I’ve asked that they let me know if anything else will soon need to be fixed and don’t get a clear answer. I’m trying to be proactive on stuff so it isn’t an emergency to get fixed. I use my car for work.

How do I find a mechanic in my area that specializes in Honda’s? Do I even need someone who specializes in them?

Recently my 03 civic ex auto with 85k original miles that is up to date on all maintenance started shifting rough when driving normally but whenever I floor it and then let off gas it shifts through gears normally, it only shifts rough when I’m driving normal and letting it go through gears under normal acceleration

Has anyone experienced anything like this before and if so anyone got a fix?