Welcome back!
Success is available. The biggest issue I’ve seen with failures is a lack of patience. I can offer my own reccomendations based on my experiences:
Start with at least half live rock (aquacultured (KP Aquatics, Tampa Bay Saltwater, Gulf Live Rock, etc) or real (Australian (pricey but I’ve heard light weight for volume))) If you can afford to use all live rock, my experience is that will help skip several of the “ugly stages” initially. I say initially as they’ll still come but just not as bad in my experience.
Many times used equipment is just as good as brand new. And just cause its not as popular doesn’t mean it won’t work. What I mean by this is many LED systems that are older work just as good as newer systems if you’re on a budget (for example Radion Gen 3 and Gen 4 work just as well as Gen 6 though you may not have certain features) but also nowadays most reef LED system will work (even the cheap ones) again it’s just features that will likely be missing. Also halide and T5 are still around. They still work. They’re just harder to find.
You don’t have to have the latest and greatest equipment. My system is very basic (halides, dosing pump and sump) and I’m starting to grow halides. Others have filter rollers, algae turf scrubbers, hefty skimmers, UV sterilizers, algae reactors, bio reactors, carbon reactors, etc, and some are successful, others have the hardest time.
One thing to keep in mind, low nutrients are generally considered a thing of the past. It’s believed that low nutrients are often the cause of algae/dino issues.
Don’t be discouraged. I hope this helps!