Our FL address is our permanent address, but we spend up to 6 months or so at other locations too. I've tried various processes over the years, with varying levels of success.
I used to do permanent changes of address back and forth, and that worked great. But then a couple of years ago the post office started notifying banks and credit card companies of the change, which caused them to change our billing address on the cards, leading to rejected charges at places that ask for your zip code. And even if I sign onto the the credit card and change it back they just do it again the next month. So I had to quit that.
Since then I've been using temporary change of addresses, which mostly works pretty well and is what I would recommend for the OP's situation. But in our case, there are problems. The post office down in FL is pretty crappy, and it often takes 2-3 weeks for them to forward the mail. I have USPS Informed Delivery, so I see when it's ready to be delivered, and can then keep track of how long it takes to get to me. If it ever does. For the last few years we seldom have gotten much important snail mail, but this year we turned 65 and have been getting a bunch of Medicare and retiree medical mail that I couldn't switch to email right away. So the physical mail has become a bit more important.
And recently I had a piece of mail that was returned to sender with a stamp on it saying something like No Such Address or something. So I'm pretty unhappy about all that.
On top of that, I can no longer do a temporary change of address from our second home back to the primary, to handle anything that comes to that address. I could until last year, but now to do a CoA online you have to sign on and it defaults to your primary address. I haven't found a way around this one yet.
I've been looking into the mail handling companies like America's Mailbox. I like the idea, but I'm not sure about them opening and scanning our mail. And I'm not quite sure how the pricing works. But I think that's the next option since the post office is working hard to make it not work for snowbirds. If anyone has any strong recommendations for that I'd appreciate hearing them.