There are multiple reasons you may want a U.S.-based mailing address and a mail forwarding service. That includes dealing with businesses that only work with people “in” the U.S. and also wanting a stable address as you move around. My experience is that many mail forwarding services lack the flexibility you might need.
U.S. Global mail is an exception. I have used them for close to 20 years while living in three different countries. They have been totally reliable. They also offer a lot of flexibility including scanning a piece of mail, combining multiple items and sending to different addresses.
You can find them at https://usglobalmail.com and if you decide to use the service and use referral code PHIL-KRC0Q78N.TH you (and I) will get a month of service for free.