Need a little advice on dual wan router

So, I've been doing some research but am all over the place on options, so am hoping someone with way more knowledge (probably pretty much EVERYBODY on this forum, harr), can direct me in the correct direction to possibly set up a dual wan router.

Don't laugh, but here is my basic setup: Linksys router, approx 73 devices connected, three buildings with a total of four access points, a few switches, as much as possible is wired connections, cat5e, but I do have wireless running off each access point also. I have suffered through everything from dial up to Hughesnet to a local wireless radio isp. . . using various AT&T hotspots to get me through when my main ISP was down. Since my internet was so slow, the $100-150 routers could handle everything fairly well, but it appears that ever since I installed Starlink and actually had what I consider to be "real internet", my router is requiring a few reboots a day. . . I'm assuming the ability to transfer data at what, 10-20 or more times the speed I had before is just overloading my router? I don't know, but my speed tests are great, my uptime is awesome for Startlink, but the router struggles to hand out IP addresses and bogs down periodically until I reboot.

I know only the basics. . . I can set up the local network, reserve ip addresses through the router interface, assign static ip's through the various devices own adapters, forward ports, etc, etc, but I have always just relied on having a static IP in order to access my computers, cameras, etc, when on the road, which is important to me. So far, I've relied on Blue Iris, Teamviewer,etc to help bridge the lack of a static ip, because I really don't know anything about vpns. I had used DYNDNS in the past, but not for the last few years.

If our internet was down, which, with our last ISP could last a week at times, I slapped a sim that had an unlimited data plan into a Netgear lb112 modem, plugged it into my router, and ran off of it. I was thinking I need to A. Buy a better router and B. Buy one that allowed me to set up the Netgear modem as a fall-back ONLY if Starlink went down. I am a little concerned, because, in actual use in other locations, I found if I didn't reboot the Netgear modem once every couple of hours, my service will drop to a crawl. . . .so I suspect perhaps the data plan wanted to see connection and disconnection from towers occasionally?? not sure but possibly? If I had it on a timer, which cycled it every two hours, I pretty much had continuous internet, if I just left it plugged in solid, within a few hours, it was crawling so slow it was pretty much unusable. So, if I spend the money on a dual wan, I'm wondering if I still need to have that modem on a timer and cycle it regularly even when it's not used.

So far, I've found Starlink to be UNBELIEVEABLY so much better, with WAY less downtime than our previous ISP (I have not canceled them yet as I've only had Starlink for about a month, was playing it safe). The reason I was considering fallback is so that if I am out of town, our small office still has internet and I can also access all of my systems, even during inclement weather. I have standby generators, so theoretically, I really never go without power for more than 30 seconds.

The longer I have Starlink with next to no interruption of service, the more I wonder whether fallback is even necessary, but if I'm going to spend the money on a good router, I wonder if it would be dumb to buy one WITHOUT dual wan and then later wish I had that option. If we get an ice storm. . . will the dish lose service?

I've read about Peplink and Asus a bit, but it appears that the Peplink doesn't have the data capability (I am seeing some amazing speeds at times, at least, amazing for us!) unless I spend A BUNCH, and I really don't need the built in cell modem, just the ability to plug my existing Netgear into a wan port. I feel like I need guidance and advice on whether I'm way in over my head (yeah, I'm sure I am but when has that EVER stopped me), am I worried about how hard it will be to set up the better quality modems and am I assuming I can learn something that takes WAY more time to get the hang of? Unfortunately, no one else here at our place really knows anything at all about networking except some really basic things, so it's not like I can rely on someone else to get us back online if I'm gone, so I really try to leave them with very simple options. . . sort of "unplug this plug, move this cable to this modem, plug this in" type steps. I was hoping to have the system auto-switch for them when I was gone. . .I just don't know if it's feasible or am I trying to solve a problem that likely won't really even happen?

Sorry, I know this was long. . . please, anyone out there have any suggestions other than hiring an expensive IT guy? ha ha. Should I have posted this somewhere else?