While most techniques for memory palace suggestion visualization, the technique itself doesn't actually require it. You can substitute with another sense if you have one unique enough to identify it (the smell of coffee, the texture of a favourite shirt, the taste of food). You basically need to associate a specific thing, with location/route you are very familiar with.

my mnemonic device has always been numerical association by athlete, or coming up with acronyms. i've been visually impaired since age 4 but have also always been a huge sports fan.

i have long since used athletes numbers to remember things like phone numbers, birthdays, pi (to more digits than is necessary), addresses, my wife & kids SSN's, the list goes on.

for example, to remember someone's birthday who is december 23rd, i'd just associate that person with "tom brady, michael jordan" (12/23). then for that same persons phone number i would do the same. if their number was 800 265-5328 (or 800-collect) it would be:
jerry rice, russell westbrook, chase utley, dikembe mutombo, jim brown, troy aikman. something like that.

for years i didn't use the contact feature in my phone since i couldn't see it to scroll through. i would have someone tell me their number and i would memorize it that way and then dial it manually each time by thinking of whatever athletes i had associated with their digits

i guess the key is breaking things down to have one thing that you "know" represent 2 or more things so that you only have to memorize a short sequence that represents a longer sequence.

then, if i am giving a presentation (or last week officiating a wedding for the first time) i will create an acronym for the outline. i can't keep notes with me or read from a promoter, so instead i take the first letter of each segment and make a silly acronym so that i can keep track of where i am and not accidentally skip over a section or something like that. kind of like "Never Eat Soggy Waffles" for north south east west, but each letter/word representing a segment of the overall presentation. it's the same idea, coming up with something that is simple and small for you to remember that triggers and directs your brain to remember something larger

I've found that the best memorization technique is just rehearsing something over and over and over until it's stuck there. I've done this with long, 5 minute plus speeches. Just because I'm terrible at reading out loud and I'll either get ahead of myself, or lag way behind.

I have the weird ability to memorize number sequences. I’m very good at memorizing codes and credit card numbers and such. I’m also good at functions and stats.