Asking about which iMac to buy 10/5/23

In the humble non-professional opinion of this untrained and unknowledgeable individual I was sold an 2019 iMac Intel with deficiencies internally.  I write this because problems began with migrating from a 2013 iMac Intel which may have been exacerbated by a failing LaCie Time Machine.  There have been situations where photos have been lost (maybe to iCloud, I don’t know).  Contacts have gone missing.  I contacted Apple Support and they had no solutions on how to restore Contacts from iCloud.

So I ask you gentlepeople for suggestions and advice in choosing my next iMac desktop that will withstand my bungling and make clear sailing possible.

Thank you head of time.