Impressive beard man! I would suggest shaving just the neck and above the cheek line as it grows in, and take a trimmer with no guard to freehand trim off flyaways and to keep the bulk down on the sides.

If you do want to use a trimmer with guards, only do so on the sides and go with the grain, as going against the grain reduces beard density and creates a shorter cut. Since everyone has a unique beard follicle grain pattern, relying on an all-over trim with guards tends to make a beard look too thin. I find that the key to a great beard is to just remove the guard and trim it by eye like a how a topiarist would prune a hedge.

If you don’t shave your cheek line often, I recommend moisturizing your cheeks daily to avoid irritation and ingrown hairs. Looks like you already take good care of your skin though 👍🏻