How Can I Learn More About 3 MVP Ideas?

I have 3 MVP ideas, each for different markets. I estimate 3 - 5 weeks to build each MVP + landing page, so 2 - 3 months in total.

I always make the mistake of diving right into building something for 3 - 4 months and then launching and giving up when the launch is underwhelming.

This time I want to do two things differently:

1) By doing 3 launches I could at least compare them and declare a winner.

2) Seeing if there's a way to validate the ideas before building the MVP

So, is there something I could do to validate these ideas before committing to a build?