You might try to switch your respirator. The Aura series (3M 9210+ being the best Aura, IME) and VFlex (3M 9105) seem to be very comfortable and easy to breathe for me & others who I've shared them with. In general, a larger surface area makes it easier to breathe.

Another option is to look for a respirator with an exhalation valve. You give up a level of source control but any exhortations to "protect others!" is pretty silly when they come from people who aren't wearing anything to protect themselves. The Aura has a vented model (9211+) which I've not tried but have heard excellent things about.

You could also consider a half-face elastomeric respirator. You wouldn't expect it, but I've found the ones made with a quality silicone material (3m 75xx / Honeywell North 7700) to be far more comfortable than disposable N95s. They have far more breathable area, which is a major plus. When adjusted properly, they also do not "dig into your face" the same way disposable respirators do - you can keep the straps surprisingly loose & still maintain a seal. And they have a much lower TCO because the respirator media lasts for a long time. Muffled speech is the biggest problem, but speech diaphragms go a ways towards fixing that.

In general though, as you move up the ladder of protection you end up using tools that are both more effective & more comfortable. Pre-pandemic I had a crawlspace under my house spray foam insulated. A team of three guys crawled around under my house in mid-August while wearing full face respirators. They told me they were actually more comfortable than the old half-mask / goggles combination they used to use.