3 months after Pulsed field ablation--peak heart rate issues

I'm three months after my second pulsed field ablation. This one covered the back wall as well, and seems to have stunned either the sinus node or some nerves. My heart rate runs 10-20 bpm below where it used to and when I try to exercise, e.g. run, it's hard for me to get the heart rate anywhere near it was before the ablation. The doctor says what I have is called chronotropic incompetence and he hasn't seen this with pulsed field ablations this long after the procedure. Choice is to get a pacemaker or give it more time.
Has anyone had a similar experience? Did it get better over time? Were there things that you did that helped? I'm not on any drugs that depress heart rate.
thx