Architecture and Construction Project Management can be very valuable to an investment firm in the areas of Design, Renovation, Construction Management, and possibly even Asset Management (assuming you're #s oriented).
It may behoove you to find investors that seem to be active but maybe their renovations can use some help (be gentle and thoughtful when telling someone their product can use some upgrades haha).
It would be a good idea to attend conferences, meet-ups, and other similar events to network with investors. As you're meeting people, listen closely and without expectation. If you hear someone say, I love X, Y, Z but could use some help with my design, construction, project management, etc. then you may have found someone you can ally with on projects. It's always good to just listen, learn, and when the right "mentor" or opportunity comes along, you'll know.
Also, don't be shy about learning new skill sets or focusing on adding value in other ways. If you love architecture and construction PM, then by all means offer that up as a way to add value. You can also learn skills in underwriting, deal sourcing, fund raising, financing, etc. The possibilities are endless so it's up to you to do the preliminary work of answering the following questions:
-What is my real estate goal?
-What asset type (multi, single-family, retail, industrial, etc.) do I want to invest in?
-How large of an investment can I make? Where would I like to make the investment?
-What function(s) do I want to oversee and how do I want to contribute?
With those basics answered, you can then go out into the world and when you see the opportunity, you will know.