I am on SSDs and we have a fast dedicated internet but I cannot get in to Outlook in less than 5-10 minutes.
I have maybe 6 or 7 on-line and on-premises accounts with Exchange 2019 & Office 365
Check the add-ins you are using under options\add-ins.
Reduce the number of months of downloaded data on the accounts.
Move the data files to a separate disk, preferably an SSD that is not the system disk.
More CPU power
Use web mail for some of the accounts if you do not need a lot of features and do not check the mail often.
Data Recovery Berkshire