There are loads of external types of RAM from various manufacturers that will fit on your board, so it's almost impossible for me to make a list of them.
It would make sense to check whether you can get by with the internal RAM, e.g. by optimising the program, eliminating unnecessary arrays and recurring variables, or even switching on the compiler's memory optimisation. If there is still not enough RAM, you should then think about which and how much data you want to swap out, and how quickly you want to access it. You can then find out whether and which type of RAM is suitable and what you need to look for from the manufacturers in question.
Good luck!
Regards
/Peter
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