As you (presumably) know, architectural photography often means working with tilts and shifts, which complicates matters when a mirrorless camera is involved and usually means adapting lenses and using them manually, which can be more of a nuisance than many people are willing to suffer.
Street photography and portraiture also have their own unique requirements and most photographers will find they're best done using gear specific to each genre.
And, obviously, your budget will directly affect the options available to you, so it's necessary to know that, too, before offering you any suggestions.
If you can provide some more info, it will be easier to offer you useful suggestions.
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